| Accionismo vienés | Viennese Actionism |
| accionista | shareholder |
| Accipiter badius | Shikra |
| Accipiter bicolor | Bicoloured Hawk |
| Accipiter brevipes | Levant Sparrowhawk |
| Accipiter gentilis | Goshawk |
| Accipiter nisus | Eurasian Sparrowhawk |
| Accipiter rufitorques | Fiji Goshawk |
| Accipitridae | Accipitridae |
| acción | stock |
| Acción al portador | Share to bearer |
| Acción Autónoma | Autonomous Action |
| Acción Católica | Azione Cattolica |
| Acción Contra el Hambre | Action Against Hunger |
| acción de ennegrecer | blackening |
| acción de gracias | thanksgiving |
| Acción Democrática | Democratic Action |
| Acción Democrática de Quebec | Action démocratique du Québec |
| Acción Directa | Action directe |
| Acción ejecutiva | Executive Action |
| acción judicial | prosecution |
| Acción mutante | Acción mutante |
| Acción pauliana | Fraudulent conveyance |
| acción programada | scheduled action |
| acción pública | public action |
| Acción racional | Rational choice theory |
| acción reivindicatoria | replevin |
| Acción Republicana | Republican Action |
| Acción social | Social actions |
| accla | wing |
| Accons | Accons |
| Accra | Accra |
| Accusar recibo | Acknowledge receipt |
| ace a | water mill |
| Ace of Base | Ace of Base |
| acebo | holly |
| acechar | waylay |
| acecho | ambush |
| acedera | sorrel |
| acedía | heartburn |
| Aceh | Aceh |
| Aceita volatil | Essential oil |
| aceitado | oiling |
| aceitar | oil |
| aceite | oil |
| aceite bronceador | suntan lotion |
| aceite de bacalao | cod liver oil |
| aceite de fusel | fusel oil |
| aceite de girasol | sunflower oil |
| aceite de guindilla | chili oil |
| aceite de hígado de bacalao | cod-liver oil |
| Aceite de la unción santa | Holy anointing oil |
| aceite de linaza | linseed oil |
| Aceite de mostaza | Mustard oil |
| aceite de oliva | olive oil |
| aceite de palma | palm oil |
| Aceite de pepitas de uva | Grape seed oil |
| aceite de ricino | castor oil |
| aceite de sentina | bilge oil |
| aceite de trementina | turpentine |
| Aceite de vitriolo | Sulfuric acid |
| Aceite esencial | Essential oil |
| Aceite explosivo | Nitroglycerin |
| Aceite lampante | Kerosene |
| aceite refrigerante | cooling oil |
| aceite vegetal | vegetable oil |
| aceite vegetal usado | WVO |
