| acropole | acropolis |
| Acropomatidae | Acropomatidae |
| Acropora | Acropora |
| Across the Universe | Across the Universe |
| acrostiche | acrostic |
| Acrotomophilie | Amputee fetishism |
| Acrotère | Acroterion |
| acrylamide | acrylamide |
| Acrylonitrile butadiène styrène | Acrylonitrile butadiene styrene |
| acréage | acreage |
| ACT New Zealand | ACT New Zealand |
| Act Up | AIDS Coalition to Unleash Power |
| Acta Apostolicae Sedis | Acta Apostolicae Sedis |
| Acta Diurna | Acta Diurna |
| Acta Eruditorum | Acta Eruditorum |
| Acta Sanctorum | Acta Sanctorum |
| Actaea | Actaea |
| acte | action |
| acte administratif | administrative deed |
| acte communautaire | Community act |
| Acte de barbarie | Torture |
| acte de bravoure | derring-do |
| acte de cacher | secretion |
| acte de commerce | commercial transaction |
| acte de décès | death certificate |
| Acte de guerre | Act of war |
| Acte de La Haye | Oath of Abjuration |
| Acte de la vie quotidienne | Activities of daily living |
| acte de malveillance | foul play |
| acte de mariage | marriage certificate |
| Acte de médiation | Act of Mediation |
| acte de naissance | birth certificate |
| Acte de Québec | Quebec Act |
| Acte de sabotage | Act of sabotage |
| Acte de terrorisme | Act of terrorism |
| acte de violence | outrage |
| Acte dolosif | Fallacy |
| Acte délictueux | Crime |
| Acte final | Last act |
| acte généreux | generosity |
| acte infâme | infamy |
| Acte judiciaire | Judicial document |
| acte juridique | juridical act |
| Acte Kansas-Nebraska | Kansas-Nebraska Act |
| Acte médical | Interference |
| Acte répréhensible | Objectionable deed |
