| acceptabel daglig dosis | ADI-Wert |
| acceptabelt risikoniveau | zulässiges Risikoniveau |
| acceptere | akzeptieren |
| Accidens | Akzidenz |
| Accipitridae | Habichtartige |
| Accise | Akzise |
| According to Jim | Immer wieder Jim |
| Accra | Accra |
| Ace of Base | Ace of Base |
| Aceh | Aceh |
| Acenaphthen | Acenaphthen |
| Acenaphthylen | Acenaphthylen |
| Acer | Acer |
| Acesulfam-kalium | Acesulfam |
| Acetoacetat | Acetessigsäure |
| Acetone | Aceton |
| Acetoneperoxid | Acetonperoxid |
| Acetophenon | Acetophenon |
| Acetyl | Acetylgruppe |
| Acetylcystein | Acetylcystein |
| Acetylen | Ethin |
| Achaea | Achaea |
| Achaier | Achaier |
| Achensee | Achensee |
| Achill Island | Achill Island |
| Achille Lauro | Achille Lauro |
| Achilles | Achilles |
| Achilleshæl | Achillesferse |
| Achillessene | Achillessehne |
| Achilleus | Achilleus |
| Achmed Sukarno | Sukarno |
| Achæmenide-dynastiet | Achämenidenreich |
| Acid Drinkers | Acid Drinkers |
| Acidose | Azidose |
| Acireale | Acireale |
| Aconcagua | Aconcagua |
| Acorn RISC Machine | ARM-Architektur |
| Acquired Immuno Deficiency Syndrome | Aids |
| Acre | Acre |
| Acrotomofili | Amelotatismus |
| Acta Eruditorum | Acta Eruditorum |
| Actin | Aktin |
| Actinid | Actinoide |
| actinider | Actinoid |
| actinium | Actinium |
| Action Directe | Action Directe |
| Actionspil | Actionspiel |
| Actium | Actium |
| Active Server Pages | Active Server Pages |
| Activity-based costing | Prozesskostenrechnung |
| ad hoc | ad hoc |
| Ada | Ada |
| Ada Lovelace | Ada Lovelace |
| Adad | Adad |
| Adagio | Adagio |
| Adalbert af Bremen | Adalbert von Bremen |
| Adam | Adam |
| Adam af Bremen | Adam von Bremen |
| Adam Copeland | Adam Copeland |
| Adam Gottlob Oehlenschläger | Adam Oehlenschläger |
| Adam Ludwig Lewenhaupt | Adam Ludwig Lewenhaupt |
| Adam Mickiewicz | Adam Mickiewicz |
| Adam Sandler | Adam Sandler |
| Adam Smith | Adam Smith |
| Adam Weishaupt | Adam Weishaupt |
| Adamaoua | Hochland von Adamaua |
| Adamello | Adamellogruppe |
| Adams Æbler | Adams Äpfel |
| adamskostume | Adamskostüm |
| adamsæble | Adamsapfel |
| Adana | Adana |
| Adaptation | Evolutionäre Anpassung |
| Adapter | Reisestecker |
| Adda | Adda |
| addere | addieren |
| addict | Süchtiger |
| Addis Ababa | Addis Abeba |
| Addisons sygdom | Nebennierenrindeninsuffizienz |
| Addition | Addition |
| Additionskredsløb | Volladdierer |
| Address resolution protocol | Address Resolution Protocol |
| Adel | Adel |
