| argument | plea |
| Argument de poids | Weighty argument |
| Argument du périastre | Argument of periapsis |
| argumentateur | argumentative |
| argumentation | disputation |
| argumenter | debate |
| argumenter contre | argue against |
| argumenter en faveur de | argue for |
| Argumentum a silentio | Argument from silence |
| Argumentum ad baculum | Argumentum ad baculum |
| Argumentum ad consequentiam | Appeal to consequences |
| Argumentum ad crumenam | Argumentum ad crumenam |
| Argumentum ad hominem | Ad hominem |
| Argumentum ad lazarum | Argumentum ad lazarum |
| Argumentum ad populum | Argumentum ad populum |
| Argumenty i Fakty | Argumenty i fakty |
| Argus bleu-nacré | Chalkhill Blue |
| Argus frêle | Small Blue |
| Argy | Argis |
| Argyll and Bute | Argyll and Bute |
| Argyresthia pruniella | Argyresthia pruniella |
| Argyrosaurus | Argyrosaurus |
| Argéades | Argead dynasty |
| Argémone mexicaine | Argemone mexicana |
| Arhangay | Arkhangai Province |
| Arhansus | Arhansus |
| Ari Lemmke | Ari Lemmke |
| Ari Vatanen | Ari Vatanen |
| Ari Þorgilsson | Ari Þorgilsson |
| Ari-Pekka Nikkola | Ari-Pekka Nikkola |
| aria | aria |
| Aria da capo | Da capo aria |
| Aria Giovanni | Aria Giovanni |
| Aria Tour | Aria Air |
| Ariadne Oliver | Ariadne Oliver |
| Ariald de Carimate | Arialdo |
| Arian Beqaj | Arjan Beqaj |
| Ariana | Aryanah |
| Ariana Richards | Ariana Richards |
| Ariane | Ariadne |
| Ariane des Pays-Bas | Princess Ariane of the Netherlands |
| Ariane et Barbe-Bleue | Ariane et Barbe-bleue |
| Ariane à Naxos | Ariadne auf Naxos |
| Ariane à ventre gris | Rufous-tailed Hummingbird |
| Arianespace | Arianespace |
| Arianisme | Arianism |
| Arianna Fontana | Arianna Fontana |
| Ariano Irpino | Ariano Irpino |
| Arianrhod | Arianrhod |
| Arianta arbustorum | Arianta arbustorum |
| Ariaramnès | Ariaramnes of Persia |
| Ariarathe | Ariarathes |
| Ariary malgache | Malagasy ariary |
| Aribe | Aribe |
| aride | desert |
| aridité | aridity |
| Aridoamérica | Aridoamerica |
| aridoculture | dry farming |
| Ariel Durant | Ariel Durant |
| Ariel Ortega | Ariel Ortega |
| Ariel Ramírez | Ariel Ramírez |
| Ariel Sharon | Ariel Sharon |
| Ariel Sharon a subi une grave attaque cérébrale | Israeli PM Sharon rushed to hospital |
| Ariel Sharon opéré une troisième fois | Israeli PM Sharon rushed to hospital |
| Ariel Zeevi | Ariel Zeevi |
| Ariete | Ariete |
| Arieş | Arieş River |
| Arigis Ier de Bénévent | Arechis I of Benevento |
| Ariidae | Ariidae |
| Arijan Komazec | Arijan Komazec |
| Arik Einstein | Arik Einstein |
| Arik-den-ili | Arik-den-ili |
| Arilje | Arilje |
| Arimaspes | Arimaspi |
| Arioald | Arioald |
| Arioch | Arioch |
| Arioli | Arioli |
| Ariolimax | Banana slug |
| Arion | Arion |
| Arion ater | Red Slug |
| Arion de Méthymne | Arion |
| Arion lusitanicus | Spanish slug |
| Arion rufus | Red Slug |
| Arion subfuscus | Arion fuscus |
| Arionidae | Arionidae |
| Ariosophie | Nazi occultism |
| Arioviste | Ariovistus |
| Aripert | Aripert I |
