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| Abacus | Abakus (m) | Abaque (m) | Abaco (m) | Àbaco (m) | |
| Abrade | Abreiben (v) | Frotter | Frizionare | Desempolvar | |
| Abrasion | Abrieb (m) | Abrasion (f) | Abrasione (f) | Desgaste (m) | |
| Acacia | Akazie (f) | Acacia (f) | Acacia (f) | Acacia (f) | |
| Acanthus | Akanthus (m) | Acanthe (f) | Acanto (m) | Acanto (m) | |
| Accelerator mass spectrometry (AMS) | Beschleunigungs-Massenspektrometrie (f) | Spectrométrie de masse par accélérateur (f) | Spettrometria di massa con acceleratore (f) | Espectrometría de aceleración de masas (f) | |
| Accumulation | Ansammlung (f) | Accumulation (f) | Accumulo (m) | Acumulación (f) | |
| Accumulation | Anhäufung (f) | Accumulation (f) | Ammasso (m) | Acumulación (f) | |
| Acetone | Aceton (nt) | Acétone (f) | Acetone (m) | Acetona (f) | |
| Acoustic irradiation | Beschallung (f) | Sonorisation (f) | Sonorizzazione (f) | Sonorización (f) | |
| Acrylic dispersion | Acryldispersion (f) | Dispersion acrylique (f) | Dispersione acrilica (f) | Dispersión acrílica (f) | |
| Acrylic paint | Acrylfarbe (f) | Peinture acrylique (f) | Colore acrilico (m) | Pinture acrílica (f) | |
| Acrylic resin | Acrylharz (nt) | Résine acrylique (f) | Resina acrilica (f) | Resina acrílica (f) | |
| Additive colour mixture | additive Farbmischung (f) | Synthése additive (f) | Mescolanza additiva (f) | Mezcla aditiva de color (f) | |
| Adhesion | Adhäsion (f) | Adhésion (f) | Adesione (f) | Adhesión (f) | |
| Adobe / Clay brick | Lehmziegel (m) | Brique d'argile (f) / Brique en terre cuite (f) | Mattone argilloso | Adobe (m) / Ladrillo cerámico (m) | Tijolo de argila (m) |
| Adze | Dechsel (f) (Deichsel/Dachsbeil/Querbeil) | Herminette (f) | Ascia (f) | Azuela (f) | |
| Agate | Achat (m) | Agate (f) | Agata (f) | Àgata (f) | |
| Agate burnisher | Achat-Polierstein (m) | Brunissoir d'agate (m) | Pietra d'agata (f) | Bruñidor (m) | |
| Age | Alter (nt) | Âge (m) | Età (f) | Edad (f) | |
| Ageing | Alterung (f) | Vieillissement (m) | Invecchiamento (m) | Envejecimiento (m) | |
| Ageing | Altern (nt) | Vieillissement (m) | Invecchiamento (m) | Envejecimiento (m) | |
| Ageing cracks | Alterssprünge (m, pl) | Craquelures (f, pl) | Spaccature (f, pl) | Craqueladuras (f, pl) | |
| Ageing process | Alterungsprozess (m) | Processus de vieillissement (m) | Processo di invecchiamento (m) | Proceso de envejecimiento (m) | |
| Agglomerate | Agglomerat (nt) | Aggloméré (m) | Agglomerato (m) | Aglomerado (m) | |
| Air space / Rear ventilation / Moisture balance / Humidity compensation | Hinterlüftung (f) / Feuchtigkeitsausgleich (m) | Aération arrière (f) / Ventilation arrière (f) / Équilibre hydrique (m) / Compensation de la humidité | Aerazione / Aggiustamento di umidità / Ventilazione posteriore / Equilibrio di umidità | Ventilación trasera (f) / Ventilación posterior (f) / Equilibrio de humedad (m) | |
| Air valve / Damper / Air vent / Air flap | Luftklappe (f) | Clapet (m) / Aération (f) / Volet de ventilation (m) | Serranda aria | Compuerta de aire (f) / Válvula de aire (f) | Aba de ventilação (f) / Válvula de membrana (f) |
| Air-conditioning / Air-conditioning unit / AC / AC system | Klimaanlage (f) | Climatisation (f) / Climatiseur (m) | Climatizzazione / Aria condizionata (f) | Aire acondicionado (m) / Sistema de climatización (m) | |
| Air-raid door / Anti-air-raid door / Bunker door | Luftschutztür (f) / Panzertüren (PT) (f.pl) | Porte antiaérienne (f) | Porta antiaerea (f) | Puerta antiaérea (f) | Porta antiaérea (f) |
| Alabaster plaster | Alabastergips (m) | Albâtre (m) | Alabastro (m) | Yeso alabastrino (m) | |
| Alcohol / Spirit | Alkohol (m) | Alcool (m) | Alcol (m) | Alcohol (m) | |
| Alder | Erle (f) | Aulne (m) | Ontano | Aliso (m) | |
| Alignment | Ausrichtung (f) | Direction (f) | Allestimento (m) | Alineación (f) | |
| Alizarin (Blue) | Alizarinblau (nt) | Bleu d'alizarine (m) | Blu d'alizarina (m) | Azul de alizarina (m) | |
| Alizarin (Brown) | Alizarinbraun (nt) | Marron d'alizarine (m) | Bruno d'alizarina (m) | Antragalol (m) | |
| Alizarin (Crimson) | Alizarin (nt) | Alizarine (f) | Alizarina (f) | Alizarina (f) | |
| Alizarin (Yellow) | Alizaringelb (nt) | Jaune d'alizarine (m) | Giallo d'alizarina (m) | Amarillo de alizarina (m) | |
| Alkali feldpsar | Alkalifeldspat (m) | Feldspath potassique (m) | Feldspato potassico (m) | Feldspato alcalino (m) | |
| Alkali metals | Alkalimetalle (nt, pl) | Métaux alcalins (m, pl) | Metalli alcalini (m, pl) | Metales alcalinos (m, pl) | |
| Alkaline earth metals (pl) | Erdalkalien (f.pl) / Erdalkalimetalle (nt.pl) | Métaux alcalino-terreux (m.pl) | Metalli alcalino terrosi (m.pl) | Metales alcalinotérreos (m.pl) | |
| Alkaline lye | Alkalilauge (f) | Solution alacaline (f) | Soluzione alcalina (f) | Lejía (f) | |
| Alkanet / Alkanna root | Alkannawurzel (f) | Alkanet (m) | Radice d'alkanna (f) | Alkanna de raiz (f) | |
| Allegory | Allegorie (f) | Allégorie (f) | Allegoria (f) | Alegoría (f) | |
| Alloy | Legierung (f) | Alliage (m) | Lega (f) | Aleación (f) | Liga (f) / Mistura (f) |
| Altarpiece | Altarbild (nt) | Tableau d'autel (m) | Pala d'altare (f) | Retablo (m) | |
| Alum | Alaun (m) | Alun (m) | Allume (m) | Alumbre (m) | |
| Aluminium hydroxide | Aluminiumhydroxid (nt) | Hydroxyde d'aluminium (m) | Idrossido di alluminio (m) | Hidróxido de aluminio (m) | |
| Amaranth | Amarant (m) | (d')amarante (f) | Amaranto | Amaranto | |
| Amber | Bernstein (m) | Ambre juane (m) | Ambra (f) | ámbar (m) | |
| American walnut | Nussbaum (amerikanischer) (m) | Noyer américain (m) | Noce americano (m) | Nogal negro americano (m) | |
| Amino acid | Aminosäure (f) | Acide aminé (m) | Aminoacido (m) | Aminoàcido (m) | |
| Ammonia | Ammoniak (nt) | Ammoniac (m) | Ammoniaca (f) | Amoníaco (m) | |
| Ammonium hydroxide | Ammoniumhydroxid (nt) | Hydroxyde d'ammonium (m) | Idrossido di ammonio(m) | Hidróxido de amonio (m) | |
| Amphiprostylos | Amphiprostylos Tempel | Amphiprostylos | Amphiprostylos | Amphiprostylos | |
| Analysis (pl.) | Analyse (f) | Analyse (f) | Analisi (f) | Análisis (m) | |
| Ancient Egyptian bell-capital | Figurenkapitell (nt) | Capital chiffré (m) | Cifra capitale | Capital de figura (f) | |
| Angle of incidence | Einfallswinkel (m) | Angle d'incidence (m) | Angolo d'incidenza (m) | ángulo incidente (m) | |
| Anisotropy | Anisotropie (f) | Anisotropie (f) | Anisotropia (f) | Anisiotropía (f) | |
| Anthracene blue | Anthrazenblau (nt) | Bleu d'anthracène (m) | Blu antracite (m) | Azul de antraceno (m) | |
| Anthracene brown | Anthrazenbraun (nt) | Braun d'anthracène (m) | Bruno antracite (m) | Marrón de atraceno (m) | |
| Antimony | Antimon (nt) | Antimoine (m) | Antimonio (m) | Antimonio (m) | |
| Antimony cinnabar | Antimonzinnober (nt) | Cinabre d'antimoine (m) | Cinabro di antimonio (m) | Cinabrio de antimonio (m) | |
| Antimony oxide/white | Antimonweiß (nt) | Blanc d'antimoine (m) | Bianco di antimonio (m) | Blanco de antimonio (m) | |
| Antimony yellow (Naples yellow) | Antimongelb (Neapelgelb) (nt) | Jaune d'antimoine (m) | Giallo d'antimonio (m) | Amarillo de antimonio (amarillo de Nápoles) (m) | |
| Antiquity / Ancient times | Altertum (nt) | Antiquité (f) | Antichità (f) | Antigüedad (f) | |
| Antiquity / Ancient times | Antike (f) | Antiquité (f) | Anitchità (f) | Antigüedad (f) | |
| Apple | Apfel (m) | Pomme (f) | Mela | Manzana (f) | |
| Application | Applikation (f) | Appliqué (f) | Applicazione (f) | Aplicación (f) | |
| Application | Anwendung (f) | Utilisation (f) | Utilizzazione (f) | Utilización (f) | |
| Application (final) / Finish | Auftrag (letzter) (m) | Dernière application (f) | Stesura finale (f) | Capa final (f) | |
| Application (of colour/paint) | Auftrag (von Farbe) (m) | Application (f) | Stesura (f) | Capa (f) | |
| Apprentice / Trainee | Lehrling (m) | Apprenti (m) | Apprendista (m) | Aprendiz (m) | Aprendiz (m) |
| Approval planning | Genehmigungsplanung (f) / Eingabeplanung (f) / Einreichplanung (f) | Planification des approbations (f) | Pianificazione dell'approvazione | Planificación de autorizaciones (f) | |
| Apse | Apsis (f) | Apside (f) | Abside (f) | ábside (m) | |
| Arabesque | Arabeske (f) | Arabesque (f) | Arabesco (m) | Arabesco (m) | |
| Arcade / Pergola | Laubengang (m) | Pergola (f) | Pergola (f) | Pérgola (f) | Pérgola (f) |
| Arch brick / Arch stone / Wedge stone | Keilstein (m) | Cale en pierre (f) / Claveau (m) | Cuneo di pietra (m) | Arco de ladrillo (m) / Dovela (piedra) (f) | |
| Arch unterside | Gewölbeuntersicht (f) | Partie inférieure arquée (f) | Lato inferiore arcuato (m) | Parte inferior arqueada (f) | |
| Architect | Architekt (m) | Architècte (m) | Architetto (m) | Arquitecto (m) | |
| Architrave | Architrav (m) | Architrave (m) | Architrave (m) | Arquitrave (f) | |
| Archivolt | Archivolte (f) | Archivolte (f) | Archivolto (m) | Arquivolta (f) | |
| Area | Bereich (m) | Endroit (m) | Ambito (m) | ámbito (m) | |
| Area / Surface area | Fläche (f) | Surface (f) / Superficie (f) | Superficie (f) | Superficie (f) / área superficial (f) | |
| Armpit joint | Geachselter Zapfen (m) | Articulation d'aisselle (f) | Giunto per ascella (m) | Articulación de la axila (f) | |
| Aromatic compound | Aromat (m) | Composé aromatique (f) | Composto aromatico (m) | Aroma (m) | |
| Arrester / Locking device | Feststeller (m) | Touche de blocage / Parafoudre (m) | Scaricatore | Descargador (m) | |
| Arsenic | Arsen (nt) | Arsenic (m) | Arsenico (m) | Arsénico (m) | |
| Art Deco | Art Déco (nt) | Art Déco (m) | Art Déco (m) | Art déco (m) | |
| Art nouveau / Jugendstil / New Style | Jugendstil (m) / Art nouveau | Art Nouveau (m) | Art Nouveau | Art nouveau / Modernismo (m) | |
| Artist | Künstler (m) / Künstlerin (f) | Artiste (m) | Artista (m) | Artista (m/f) | |
| Asbestos | Asbest (m) | Asbeste (m) / Amiante (m) | Asbesto (m) | Asbesto (m) / Amianto (m) | |
| Asbestos cement | Asbestzement (m) | Amiante-ciment (m) | Cemento-amianto (m) | Cemento de amianto (m) | |
| Asbestos removal / Asbestos decontamination / Asbestos abatement | Asbestsanierung (f) / Asbestentsorgung (f) | Désamiantage (m) | Riduzione dell'amianto | Eliminación del amianto (f) | |
| Asbestosis | Asbestose (f) / Asbestlunge (f) | Asbestose (m) / Amiantose (m) | Asbestosi | Asbestosis (f) | |
| Ash | Esche (f) | Frêne (m) | Cenere (f) / Frassino (m) | Fresno (m) | |
| Ash(es) (pl.) | Asche (f) | Cendre(s) (f.pl) | Cenere (f) | Ceniza (f) | |
| Asphalt | Asphalt (m) | Asphalte (m) | Asfalto (m) | Asfalto (m) | |
| Atom | Atom (n) | Atome (m) | Atomo (m) | Àtomo (m) | |
| Atomic mass | Atommasse (f) | Masse atomique (f) | Massa atomica (f) | Masa atómica (f) | |
| Atrium | Atrium (n) | Atrium (m) | Atrio (m) | Atrio (m) | |
| Attachment | Befestigung (f) | Fixation (f) | Fissago (m) | Fijación (f) | |
| Auripigment | Auripigment (n) | Orpiment (m) | Orpimento (m) | Oropimente (m) | |
| Authenticity | Echtheit (f) | Authenticité (f) | Autenticità (f) | Authenticidad (f) | |
| Axe | Axt (f) | Hache (f) | Ascia (f) | Hacha (m) | |
| Axis | Achse (f) | Axe (m) | Asse (m) | Eje (m) | |
| Axle of dowel | Dübelachse (f) | Axe du goujon (m) / de la cheville (f) | Asse del tassello (m) / della caviglia (f) | Axis de clavija (f) / pasador (m) | |
| Azo dye | Azofarbstoff (m) | Colorant azoïque (m) | Azocomposto (m) | Colorante azoico (m) | |
| Azurite | Azurit (nt) | Azurite (f) | Azzurrite (f) | Azurita (f) | |
| abutment | Widerlager | piédroit | piedritto | estribo | |
| abutment pier, buttress, counterfort | Strebepfeiler | Strebepfeiler | Strebepfeiler | Strebepfeiler | |
| accelerate | beschleunigen (v) | accélérer | accelerare | acelerar | |
| acid(ic) | sauer (adj) | acide | acido | àcido | |
| add / mix | beimischen (v) | ajouter | miscelare | añadir | |
| adjacent | angrenzend (adj) | adjacent | adiacente | adyacente | |
| affect | einwirken auf (v) | exercer une action sur | avere un'azione benefica su | afectar a | |
| age | altern (v) | vieillir | invecchiare | envejecer | |
| alcohol soluble | alkohollöslich (adj) | soluble dans l'acool | solubile in alcool | soluble ein alcohol | |
| align | ausrichten (v) | aligner | allestire | alinear | |
| alkali-soluble | alkalilöslich (adj) | soluble en solution alcaline | solubile in soluzione alcalina | soluble en alcalis | |
| alkaline | alkalisch (adj) | alcalin | alcalino | alcalino | |
| altar | Altar | autel m. | altare | retablo | |
| aluminium hollow profile | Aluminium Hohlprofil | profil d'aluminium | profilo d'alluminio | perfil d'aluminio | |
| amorphous | amorph (adj) | amorphe | amorfo | amorfo | |
| angle / bracket / chevron | Winkel | angle / encoignure | angolo / canto | ángulo / escuadra | |
| angle band | Winkelband | bande d'angle | spalletta | cinta angular | |
| angular sheet, angular plate | Winkelblech | | | | |
| antae temple | Antentempel | | | | |
| apply | anwenden (v) | utiliser | applicare | utilizar | |
| apply | auftragen (v) | appliquer | applicare | aplicar | |
| apply gold leaf | anschießen (blattgold) (v) | appliquer | applicare l'oro | aplicar (hoja de oro) | |
| arch stone, trap | Schlussstein | Schlussstein | Schlussstein | Schlussstein | |
| arched lintel; segmental arch | Segmentbogen | Segmentbogen | Segmentbogen | Segmentbogen | |
| architrave | Zarge (f) / Architrav (m) | châssis (m) / dormant (m) | telaio (m) / cornice (f) | cerco (m) | |
| arm of shutter | Ausstellschere / Rollladenarm | bras de volet roulant | braccio di persiana avvolgibile | brazo de persiana enrollable | |
| astragalus | Astragal | astragale | | | |
| attach | befestigen (v) | attacher | fissare | sujetar | |
| attic | attisch (adj) | attique | attico | ático | |