There are multiple definitions:

1. artificial insemination by donor(English)

   • AIH
   • Embryology /reproduction

2. activation-induced cytidine deaminase(English)

   • targets transcriptionally active immunoglobulin heavy chain (IgH) switch donor and acceptor DNA
   • CSR, DNA, IgH, 3'RR
   • Genetics
   • https://doi.org…cel.2018.08.042

3. Agency for International Development(English)

   • Organizations (international)

4. autoimmune disease(English)

   • ADEM, CNS, COVID-19, CVST, GBS, MG, PNS, TM
   • Autoimmunity
   • https://doi.org…55/2022/1283729

5. apparent ileal digestibility(English)

   • ATTD, FTU
   • Gastroenterology, Nutrition
   • https://doi.org…1093/jas/skz151