| acute | agudo |
| Acute abdomen | Abdômen agudo |
| acute accent | acento agudo |
| Acute intermittent porphyria | Porfiria aguda intermitente |
| acute lymphoblastic leukemia | leucemia linfoblástica aguda |
| Acute myeloid leukemia | Leucemia mielóide aguda |
| Acute pancreatitis | Pancreatite |
| Acute renal failure | Insuficiência renal aguda |
| Acute respiratory distress syndrome | Síndrome do desconforto respiratório do adulto |
| acute triangle | triângulo |
| Acute Viral Nasopharyngitis | Resfriado |
| acute-angled | acutângulo |
| acutely | agudamente |
| acuteness | agudeza |
| Acv | Hovercraft |
| Acy-Romance | Acy-Romance |
| acyclic | acíclico |
| acycloguanosine | acicloguanosina |
| acyl | acila |
| acylamide | acilamida |
| acylation | acilação |
| acylglycerol | acilglicerol |
| acyltransferase | aciltransferase |
| acyrologia | acirologia |
| Acácio Cordeiro Barreto | Acácio Cordeiro Barreto |
| ad | anúncio |
| AD (Anno Domini) | DC (Depois de Cristo) |
| ad banner | banner |
| Ad break | Pub |
| Ad Dakhiliyah Region | Ad Dakhiliyah |
| ad hoc | ad hoc |
| Ad hominem | Argumentum ad hominem |
| ad infinitum | infinitamente |
| ad lib | à vontade |
| ad nauseam | até enjoar |
| ad- | ad- |
| Ad-Aware | Ad-Aware |
| ad-lib | improvisação |
| ad-librn | sem preparação prévia |
| Ad-supported computer software | Browser Helper Object |
| Ada | Ada |
| Ada Lovelace | Ada Lovelace |
| Ada of Caria | Ada |
| ADAC | ADAC |
| adactylism | adactilia |
| Adad | Adad |
| Adad-nirari I | Adad-nirari I |
| Adad-nirari II | Adad-nirari II |
| Adad-nirari III | Adad-nirari III |
| adage | adágio |
| adagial | adagial |
| adagietto | adagietto |
| adagio | adágio |
| Adah | Ada |
| Adair County | Condado de Adair |
| Adaja | Rio Adaja |
| Adaloald | Adaloaldo |
| Adam | Adão |
| Adam Afzelius | Adam Afzelius |
| Adam and Eve | Adão e Eva |
| Adam Clayton | Adam Clayton |
| Adam Copeland | Adam Copeland |
| Adam Czerniaków | Adam Czerniakow |
| Adam Darski | Nergal |
| Adam de la Halle | Adam de la Halle |
| Adam Kadmon | Adam Kadmon |
| Adam Kazimierz Czartoryski | Adam Kazimierz Czartoryski |
| Adam Levine | Adam Levine |
| Adam Maida | Adam Joseph Maida |
| Adam Małysz | Adam Małysz |
| Adam Mickiewicz | Adam Mickiewicz |
| Adam of Bremen | Adão de Bremen |
| Adam Ries | Adam Ries |
| Adam Rodríguez | Adam Rodriguez |
| Adam Sandler | Adam Sandler |
| Adam Savage | Adam Savage |
| Adam Smith | Adam Smith |
| Adam Weishaupt | Adam Weishaupt |
| Adam Willard | Atom Willard |
| Adam's apple | pomo-de-adão |
| adamant | duro |
| adamantane | adamantano |
| adamantinely | adamantinamente |
| adamantinoma | adamantinoma |
| Adamantios Androutsopoulos | Adamantíos Andrutsópulos |
| adamantium | adamantium |
| adamantptation | adamantino |
| adamantyl | adamantila |
| Adamawa | Adamaoua |
| Adamawa Plateau | Adamaoua |
| Adamawa Province | Adamaoua |
| Adamawa State | Adamaoua |
| adambulacral | adambulacral |
| Adamic | adâmico |
| Adamite | adamita |
| Adamnan | Adamnan |
| Adamorobe Sign Language | Língua Gestual de Adamorobe |
| Adams | Adams |
| Adams County | Condado de Adams |
| Adams-Stokes syndrome | Síndrome de Adams-Stokes |
| adamsite | adamsita |
| Adamswiller | Adamswiller |
| Adana | Adana |
| Adana Province | Adana |
| Adansonia | Adansonia |
| Adansonia digitata | Adansonia |
| Adapa | Adapa |
| adapalene | adapaleno |
| Adapatative radiation | Radiação adaptativa |
| Adapazarı | Adpazarı |
| adapt | adaptar |
| adapt to | adequar |
| adaptability | adaptabilidade |
| adaptable | adaptável |
