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| Abaque (m) | Abakus (m) | Abacus | Abaco (m) | Àbaco (m) | |
| Abrasion (f) | Abrieb (m) | Abrasion | Abrasione (f) | Desgaste (m) | |
| Abschalung (f) Deckenstirne (f) | Abschalung (f) Deckenstirne (f) | stop end | Abschalung (f) Deckenstirne (f) | Abschalung (f) Deckenstirne (f) | |
| Acacia (f) | Akazie (f) | Acacia | Acacia (f) | Acacia (f) | |
| Acajou (m) | Mahagoni (nt) | Mahogany | Mogano (m) | Caoba (f) | Mogno (m) |
| Acanthe (f) | Akanthus (m) | Acanthus | Acanto (m) | Acanto (m) | |
| Accrochage (m) | Hängung (f) | Hanging (of pictures) | Modo di apprendere (m) | Suspensión (m) | |
| Accumulation (f) | Ansammlung (f) | Accumulation | Accumulo (m) | Acumulación (f) | |
| Accumulation (f) | Anhäufung (f) | Accumulation | Ammasso (m) | Acumulación (f) | |
| Acide aminé (m) | Aminosäure (f) | Amino acid | Aminoacido (m) | Aminoàcido (m) | |
| Acier (m) | Stahl (m) | Steel | Acciaio (m) | Acero (m) | |
| Acier affiné (m) | Edelstahl (m) | Stainless steel | Acciaio inox (m) | Acero inoxidable (m) | |
| Acier de Damas (m) | Damaszener Stahl (m) | Damascus steel | Acciaio Damasco (m) | Acero damasquino (m) | |
| Acétone (f) | Aceton (nt) | Acetone | Acetone (m) | Acetona (f) | |
| Adhésion (f) | Adhäsion (f) | Adhesion | Adesione (f) | Adhesión (f) | |
| Agate (f) | Achat (m) | Agate | Agata (f) | Àgata (f) | |
| Agent de fumigation (m) | Begasungsmittel (nt) | Fumigant | Mezzo di fumigazione (m) | Agente de fumigación (m) | |
| Aggloméré (m) | Agglomerat (nt) | Agglomerate | Agglomerato (m) | Aglomerado (m) | |
| Air sortant / Évent de sortie | Dunstrohr (nt) | Outlet vent | Aria di scarico / Sfiato di uscita | Rejilla de ventilación (f) / Aire de salida | |
| Albâtre (m) | Alabastergips (m) | Alabaster plaster | Alabastro (m) | Yeso alabastrino (m) | |
| Alcool (m) | Alkohol (m) | Alcohol / Spirit | Alcol (m) | Alcohol (m) | |
| Alizarine (f) | Alizarin (nt) | Alizarin (Crimson) | Alizarina (f) | Alizarina (f) | |
| Alkanet (m) | Alkannawurzel (f) | Alkanet / Alkanna root | Radice d'alkanna (f) | Alkanna de raiz (f) | |
| Alliage (m) | Legierung (f) | Alloy | Lega (f) | Aleación (f) | Liga (f) / Mistura (f) |
| Allégorie (f) | Allegorie (f) | Allegory | Allegoria (f) | Alegoría (f) | |
| Alun (m) | Alaun (m) | Alum | Allume (m) | Alumbre (m) | |
| Ambre juane (m) | Bernstein (m) | Amber | Ambra (f) | ámbar (m) | |
| Amiante-ciment (m) | Asbestzement (m) | Asbestos cement | Cemento-amianto (m) | Cemento de amianto (m) | |
| Ammoniac (m) | Ammoniak (nt) | Ammonia | Ammoniaca (f) | Amoníaco (m) | |
| Amphiprostylos | Amphiprostylos Tempel | Amphiprostylos | Amphiprostylos | Amphiprostylos | |
| Analyse (f) | Analyse (f) | Analysis (pl.) | Analisi (f) | Análisis (m) | |
| Angle biseauté | Fase (f) | Bevel / Chamfer | Smusso | Biselado (m) | |
| Angle d'incidence (m) | Einfallswinkel (m) | Angle of incidence | Angolo d'incidenza (m) | ángulo incidente (m) | |
| Anisotropie (f) | Anisotropie (f) | Anisotropy | Anisotropia (f) | Anisiotropía (f) | |
| Antimoine (m) | Antimon (nt) | Antimony | Antimonio (m) | Antimonio (m) | |
| Antiquité (f) | Antike (f) | Antiquity / Ancient times | Anitchità (f) | Antigüedad (f) | |
| Antiquité (f) | Altertum (nt) | Antiquity / Ancient times | Antichità (f) | Antigüedad (f) | |
| Apogée (f) | Fiale (f) | Pinnacle | Cuspide | Cúspide (f) | |
| Appareil respiratoire (m) | Atemschutz (m) | Breathing protection | Protezione vie respiratorie (f) | Protección respiratoria (f) | |
| Application (f) | Auftrag (von Farbe) (m) | Application (of colour/paint) | Stesura (f) | Capa (f) | |
| Appliqué (f) | Applikation (f) | Application | Applicazione (f) | Aplicación (f) | |
| Apprenti (m) | Lehrling (m) | Apprentice / Trainee | Apprendista (m) | Aprendiz (m) | Aprendiz (m) |
| Apprêt isolant (m) | Absperrschicht (f) | Sealer | Imprimitura (f) | Sellador (m) | |
| Appui de fenêtre (m) / Rebord de fenêtre (m) | Fensterbank (f) | Sill / Windowsill | Davanzale | Alféizar (m) / Alféizar de la ventana (m) | |
| Appui de fenêtre en métal (m) | Fensterbank, Metall (f) | Windowsill, metal | Davanzale, metallo (m) | Alféizar metálico (m) | |
| Apside (f) | Apsis (f) | Apse | Abside (f) | ábside (m) | |
| Aquarelle (f) | Aquarellbild (nt) | Watercolour painting | Acquarello (m) | Acuarela (f) | |
| Arabesque (f) | Arabeske (f) | Arabesque | Arabesco (m) | Arabesco (m) | |
| Arbre (m) | Baum (m) | Tree | Albero (m) | árbol (m) | |
| Arc de panier avec quatre points d'application (m) | Korbbogen mit vier Einsatzpunkten (m) | Basket arch with four anchor points | Arco del cestello con quattro punti di applicazione (m) | Arco de cesta con cuatro puntos de aplicación (m) | |
| Arc de panier avec trois points d'application (m) | Korbbogen mit drei Einsatzpunkten (m) | Basket arch with three anchor points | Arco del cestello con tre punti di applicazione (m) | Arco de cesta con tres puntos de aplicación (m) | |
| Arc de quille (m) | Kielbogen (m) | Ogee arch / Keel arch | Arco di chiglia (m) | Arco conopial (m) | |
| Arc elliptique (m) | Ellipsenbogen (m) | Elliptical arc | Arco ellittico | Arco elíptico (m) | |
| Arc en demi-cercle (m) | Halbkreisbogen (m) | Semicircular arch | Arco semicircolare (m) | Arco de medio punto (m) | |
| Arc en ogive (m) | Lanzettbogen (m) | Lancet arch | Arco a lancetta (m) | Arco de lanceta (m) | Arco lancetado (m) |
| Arc en plein cintre (m) | Giebelbogen (m) | Gable arch | Arco a timpano (m) | Arco de gablete (m) | |
| Arc en plein cintre équilatéral (m) | Gleichseitiger Spitzbogen (m) | Equilateral pointed arch | Arco a sesto acuto equilatero (m) | Arco ojival apuntado (m) | |
| Arc outrepassé (m) | Hufeisenbogen (m) | Horseshoe arch | Arco a ferro di cavallo (m) | Arco de herradura (m) | |
| Arc parabolique (m) / Arc de chaîne (m) | Parabelbogen (m) / Kettenbogen (m) | Parabolic arch / Catenary arch | Arco parabolico (m) / Arco a catena (m) | Arco parabólico (m) / Arco de cadena (m) | |
| Arc pointu pressé (m) | Gedrückter Spitzbogen (m) | Pressed pointed arch / Pressed ogive | Arco a sesto acuto pressato (m) | Arco ojival prensado (m) | |
| Arche de carrosse (f) | Karniesbogen (m) | Ogee arch | Arco carnies (m) | Arco de feria (m) | |
| Architrave (m) | Architrav (m) | Architrave | Architrave (m) | Arquitrave (f) | |
| Architècte (m) | Architekt (m) | Architect | Architetto (m) | Arquitecto (m) | |
| Archivolte (f) | Archivolte (f) | Archivolt | Archivolto (m) | Arquivolta (f) | |
| Argile (f) / Terre glaise (f) | Lehm (m) | Clay / Loam | Argilla (f) / Argilloso | Arcilla (f) / Barro (m) | Barro (m) / Argila (f) / Lama (f) |
| Arsenic (m) | Arsen (nt) | Arsenic | Arsenico (m) | Arsénico (m) | |
| Art Déco (m) | Art Déco (nt) | Art Deco | Art Déco (m) | Art déco (m) | |
| Art Nouveau (m) | Jugendstil (m) / Art nouveau | Art nouveau / Jugendstil / New Style | Art Nouveau | Art nouveau / Modernismo (m) | |
| Articulation (f) / Jointure (f) | Gelenk (nt) | Joint / Hinge | Snodo (m) | Conjunto (m) / Articulación (f) | |
| Articulation d'aisselle (f) | Geachselter Zapfen (m) | Armpit joint | Giunto per ascella (m) | Articulación de la axila (f) | |
| Articulation à double pivot (f) | Doppelzapfen (m) | Double pivot joint / Double tenon joint | Giunto a doppio perno (m) | Junta de doble pivote (f) | |
| Articulation à queue d'aronde en queue d'aronde (f) | Schwalbenschwanz Halbierung (f) / Schwalbenschwanzblatt (nt) | Dovetailed halving Joint | Dimezzamento a coda di rondine Giunto (m) | Cola de milano a la mitad Junta (f) | |
| Articulation à tenon (f) | Einfacher Zapfen (m) | Stub mortise and tenon joint | Giunto a tenone (m) | Articulación de espiga (f) | |
| Articulation à tenon croisé (f) | Kreuzkamm (m) | Crossed tenon joint | Giunto a tenone incrociato (m) | Articulación de espiga cruzada (f) | |
| Articulation à tenon hanté (f) | Abgesteckter Zapfen (m) / Zapfen mit Abstirnung (m) | Haunched tenon joint | Giunto a tenone (m) | Articulación de espiga perforada (f) | |
| Articulation émoussée (f) | Stumpfer Stoss (m) / Gerader Stoss (m) | Blunt joint / Blunt connection / Straight connection | Giunto smussato (m) | Articulación roma (f) | |
| Artisan (m) / Bricoleur (m) | Handwerker (m) | Craftsman / Tradesman / Handyman / Artisan / Builder | Artigiano (m) | Artesano (m) | |
| Artiste (m) | Künstler (m) / Künstlerin (f) | Artist | Artista (m) | Artista (m/f) | |
| Asbeste (m) / Amiante (m) | Asbest (m) | Asbestos | Asbesto (m) | Asbesto (m) / Amianto (m) | |
| Asbestose (m) / Amiantose (m) | Asbestose (f) / Asbestlunge (f) | Asbestosis | Asbestosi | Asbestosis (f) | |
| Asphalte (m) | Asphalt (m) | Asphalt | Asfalto (m) | Asfalto (m) | |
| Atome (m) | Atom (n) | Atom | Atomo (m) | Àtomo (m) | |
| Atrium (m) | Atrium (n) | Atrium | Atrio (m) | Atrio (m) | |
| Attaque des insectes (f) / Invasion d'insectes (f) | Insektenbefall (m) | Insect attack / Insect infestation | Infestazione da insetti / Attacco di insetti (m) | Infestación de insectos (f) / Ataque de insectos (m) | |
| Atélier (m) | Atelier (n) | Studio | Bottega (f) | Estudio artístico (m) | |
| Aulne (m) | Erle (f) | Alder | Ontano | Aliso (m) | |
| Authenticité (f) | Echtheit (f) | Authenticity | Autenticità (f) | Authenticidad (f) | |
| Axe (m) | Achse (f) | Axis | Asse (m) | Eje (m) | |
| Axe du goujon (m) / de la cheville (f) | Dübelachse (f) | Axle of dowel | Asse del tassello (m) / della caviglia (f) | Axis de clavija (f) / pasador (m) | |
| Azur (m) | Bergblau (nt) / Azurblau (nt) | Mountain blue / Azure | Azzurro (m) | Azur (m) | |
| Azurite (f) | Azurit (nt) | Azurite | Azzurrite (f) | Azurita (f) | |
| Aération (f) | Belüftung (f) | Ventilation | Ventilazione (f) | Ventilación (f) | |
| Aération arrière (f) / Ventilation arrière (f) / Équilibre hydrique (m) / Compensation de la humidité | Hinterlüftung (f) / Feuchtigkeitsausgleich (m) | Air space / Rear ventilation / Moisture balance / Humidity compensation | Aerazione / Aggiustamento di umidità / Ventilazione posteriore / Equilibrio di umidità | Ventilación trasera (f) / Ventilación posterior (f) / Equilibrio de humedad (m) | |
| abergements de plomb | Bleilappen | lug of lead | lobo di piombo | Bleilappen | |
| abîmé | beschädigt (adj) | damaged | danneggiato | deteriorado | |
| accélérer | beschleunigen (v) | accelerate | accelerare | acelerar | |
| acide | sauer (adj) | acid(ic) | acido | àcido | |
| adjacent | angrenzend (adj) | adjacent | adiacente | adyacente | |
| aiguille | Turmspitze | spire | | aguja f. | |
| ajouter | beimischen (v) | add / mix | miscelare | añadir | |
| alcalin | alkalisch (adj) | alkaline | alcalino | alcalino | |
| aligner | ausrichten (v) | align | allestire | alinear | |
| amorphe | amorph (adj) | amorphous | amorfo | amorfo | |
| angle / encoignure | Winkel | angle / bracket / chevron | angolo / canto | ángulo / escuadra | |
| aplanir | ebnen (v) | flatten / level | appianare | allanar | |
| appliquer | auftragen (v) | apply | applicare | aplicar | |
| appliquer | anschießen (blattgold) (v) | apply gold leaf | applicare l'oro | aplicar (hoja de oro) | |
| armature de connexion horizontale | Anschlussbewehrung horizontal | horizontal connection armoring | armatura di connessione orizzontale | armadura de conexión horizontal | |
| armature de connexion per plafond | Anschlussbewehrung für Decke | connection armoring for ceiling | armatura di connessione per coperta | armadura de conexión por cubierta | |
| armature de connexion verticale | Anschlussbewehrung vertikal | vertical connection armoring | armatura di connessione verticale | armadura de conexión vertical | |
| armature horizontale | Bewehrung horizontal | horizontal armoring | armatura orizzontale | armadura horizontal | |
| armature verticale | Bewehrung vertikal | vertical armoring | armatura verticale | armadura vertical | |
| astragale | Astragal | astragalus | | | |
| attacher | befestigen (v) | attach | fissare | sujetar | |
| attique | attisch (adj) | attic | attico | ático | |
| autel m. | Altar | altar | altare | retablo | |
| auvent m. | Vordach | canopy | tettoia f. | colgadizo m. | |
| aérer | belüften (v) | ventilate | ventilare | ventilar | |
| aérer | lüften (v) | ventilate | aerare | ventilar | ventilar |