| ackurat | précis |
| ackusativ | accusatif |
| Ackusatoriskt system | Procédure accusatoire |
| Aclens | Aclens |
| Acme | ACME |
| Acoelomater | Acoelomata |
| Acomoclitic | Acomoclitisme |
| Aconcagua | Aconcagua |
| Acorn | Acorn |
| Acorn Archimedes | Archimède |
| Acquarossa | Acquarossa |
| Acre | Acre |
| Acrefloden | Rio Acre |
| Acrocanthosaurus atokensis | Acrocanthosaure |
| actinid | actinide |
| actinium | actinium |
| action | action |
| Action Directe | Action directe |
| Action française | Action française |
| Action painting | Action Painting |
| Action Replay | Action Replay |
| Actionfigur | Figurine articulée |
| actionfilm | film d'action |
| Actionscript | ActionScript |
| Actium | Actium |
| Active Server Pages | Active Server Pages |
| Actors Studio | Actors Studio |
| Actraiser | ActRaiser |
| Acura | Acura |
| AD | AD |
| ad hoc | ad hoc |
| Ad hominem-argument | Argumentum ad hominem |
| ad libitum | à volonté |
| ad nauseam | jusqu'à la nausée |
| Ad-Dali | Dhala |
| Ada | Ada |
| Ada Lovelace | Ada Lovelace |
| Ada Mae Johnson | Violet Blue |
| ADAC | ADAC |
| Adachi | Adachi |
| Adad | Adad |
| adagio | adagio |
| Adal | Adal |
| Adalbert Gyrowetz | Adalbert Gyrowetz |
| Adam | Adam |
| Adam Afzelius | Adam Afzelius |
| Adam av Bremen | Adam de Brême |
| Adam Clayton | Adam Clayton |
| Adam Darski | Nergal |
| Adam de la Halle | Adam de la Halle |
| Adam Elsheimer | Adam Elsheimer |
| Adam Ferguson | Adam Ferguson |
| Adam Johann von Krusenstern | Johann Adam von Krusenstern |
| Adam Levine | Adam Levine |
| Adam Małysz | Adam Małysz |
| Adam Mickiewicz | Adam Mickiewicz |
| Adam Nelson | Adam Nelson |
| Adam och Eva | Adam |
| Adam Sandler | Adam Sandler |
| Adam Smith | Adam Smith |
| Adam Weishaupt | Adam Weishaupt |
| Adamantisaurus mezzalirai | Adamantisaurus |
| Adamello | Adamello-Presanella |
| Adamit | Adamite |
| Adams | Adams |
| Adams revben | Madame porte la culotte |
| Adamstown | Adamstown |
| adamsäpple | pomme d'Adam |
| Adana | Adana |
| Adapazarı | Adapazarı |
| adapter | adaptateur |
| Adasaurus mongoliensis | Adasaurus |
| Adda | Adda |
| Addaxantilop | Addax |
| addend | cumulateur |
| addera | additionner |
