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| Illumination / Lighting | Beleuchtung (f) | Éclairage (m) | Illuminazione (f) | Iluminación (f) | |
| Image carrier | Bildträger (m) | Support (m) | Sopporto (m) | Soporte (m) | |
| Impasto (m) | Impasto (nt) | Impasto (m) / Empâtement | Impasto (m) | Empasto (m) | |
| Impregnation / Saturation | Durchtränkung (f) | Imprégnation (f) | Impregnazione (f) | Impreganación (f) | |
| Impressionism | Impressionismus (m) | Impressionnisme (m) | Impressionismo (m) | Impresionismo (m) | |
| Inclined pivot joint / Angled tenon joint | Schräger Zapfen (m) | Joint articulé incliné (m) | Giunto a perno inclinato (m) | Junta de pivote inclinado (f) | |
| Incrustation | Inkrustation (f) | Incrustation (f) | Incrostazione | Incrustación (f) | |
| Infestation | Befall (m) | Infestation (f) | Infestazione (f) | Infestación (f) | |
| Infill / Filling / Padding | Füllung (f) | Remplissage (m) / Farce (f) / Panneau (m) | Riempimento / Farcitura / Pannello (m) | Relleno (m) / Llenado (m) | |
| Influence | Einfluss (m) | Influence (m) | Influsso (m) | Influjo (m) | |
| Injection | Einspritzung (f) | Injection (f) | Puntura / Iniezione (f) | Inyección (f) | |
| Inlay / Insert | Einlage (f) / Einlegearbeit (f) / Intarsie (f) | Incrustation (f) | Tarsia (f) | Plantilla (f) /Trabajo de marquetería (m) | |
| Inlet plate / Inflow sheet | Einlaufblech (nt) | Plaque d'entrée (f) | Piastra di ingresso | Plato de entrada (m) | |
| Inlet plates with nose | Einlaufbleche mit Nase (nt.pl) | Plaques d'entrée avec nez (f.pl) | Piastre d'ingresso con naso | Placas de entrada con nariz (f.pl) | |
| Inner bailey / Inner ward | Kernburg (f) / Hauptburg (f) / Hochburg (f) / innere Burg (f) | Château central (m) / Château principal (m) | Mucleo del castello (m) / Core castello (m) | Castillo central (m) | |
| Inner support shell | Innere Tragschale (f) | Coque de support intérieure (f) | Guscio interno di supporto (m) | Carcasa de soporte interior (f) | |
| Insect | Insekt (nt) | Insecte (m) | Insetto (m) | Insecto (m) / Bicho (m) | |
| Insect attack / Insect infestation | Insektenbefall (m) | Attaque des insectes (f) / Invasion d'insectes (f) | Infestazione da insetti / Attacco di insetti (m) | Infestación de insectos (f) / Ataque de insectos (m) | |
| Installation shaft | Installationsschacht (m) | Conduit de montage (m) | Pozzo di installazione (m) | Pozo de montaje (m) / Pozo de acceso (m) | |
| Insulating glass / Multi-pane insulating glass / Multi-glazed insulating glass | Isolierglas (nt) / Mehrscheiben-Isolierglas (nt) / Wärmedämmverglasung (f) / Isolierverglasung (f) | Verre isolant (m) / Verre isolant multi-verre (m) / Vitrage isolant thermique (m) / Vitrage isolant (m) | Vetro isolante (m) / Vetro isolante a più pannelli (m) / Vetri isolanti termici (m) / Vetri isolanti (m) | Acristalamiento aislante (m) / Acristalamiento multicapa (m) / Acristalamiento con aislamiento térmico (m) | |
| Insulation | Dämmung (f) | Isolation (f) | Isolamento (m) | Aislante (m) | |
| Insulation | Isolierung (f) | Isolement (m) / Isolation (f) | Isolamento (m) | Aislamiento (m) / Aislante (m) | |
| Interior cladding / Wall panelling | Innenverkleidung (f) / Wandverkleidung (f) | Revêtement intérieur (m) / Panneaux muraux (m.pl) | Rivestimento interno (m) / Rivestimenti murali (m) | Revestimiento interior (m) / Revestimiento de paredes (m) | |
| Interior door / Internal door / Inner door / Room door | Innentür (f) / Zimmertür (f) | Porte intérieure (f) | Porta interna (f) | Puerta interior (f) / Puerta de interior (f) / Puerta interna (f) | |
| Interior plaster | Innenputz (m) | Plâtre intérieur (m) | Intonaco interno (m) | Enlucido interior (m) | |
| Interior wall / Internal wall / Inner wall | Innenwand (f) | Mur intérieur (m) / Paroi intérieure (f) | Parete interna (f) | Pared interior (f) / Pared interna (f) / Muro interior (m) | |
| Inventory / Cataloguing | Inventarisierung (f) / Inventarisieren (nt) | Inventaire (m) | Inventario (m) / Inventariazione (f) | Inventario (m) / Catalogación (f) | |
| Ionic order | Ionische Ordnung (f) | Ordre ionique (m) | Ordine ionico (m) | Orden iónico (m) | |
| Iron | Eisen (nt) | Fer (m) | Ferro (m) | Hierro (m) | |
| Ivory | Elfenbein (nt) | Ivoire (m) | Avorio (m) | Marfil (m) | |
| Ivory black | Beinschwarz (nt) / Elfenbeinschwarz (nt) | Noir d'ivoire (m) | Nero d'avorio (m) | Negro de marfil (m) | |
| illuminate | beleuchten (v) | éclairer | illuminare | alumbrar | |
| impact / footfall sound insulation | Trittschalldämmung | insonorisation contre le bruit de contact | isolamento acustico | insonorización | |
| impregnate / waterproof / soak | imprägnieren (v) | imprégner | impregnare | impregnar / impermeabilizar | |
| infest | befallen (v) | infester | infestare | infestar | |
| influence | beeinflussen (v) | influencer | influenzare | influir | |
| inlaid | eingelegt (adj) | marqueté | intarsiato | inserto | |
| inlay | einlegen (v) | incruster | intarsiare | añadir | |
| inorganic | anorganisch (adj) | inorganique | inorganico | inorgánico | |
| insert | einbringen (v) | insérer | inserire | aportar | |
| irradiate / illuminate / shine on | bestrahlen (v) | irradir | irradiare | irradiar | |