There are multiple definitions:

1. osteoclast differentiation factor(English)

   • OCIF

2. orientation distribution function(English)

   • DTI, FOD, HMOA, MRI, NuFO, SD, WM
   • Medical imaging, Brain (dys)function
   • https://doi.org….1002/hbm.22080

3. overall defensive functioning(English)

   • DPN, DMRS
   • Psychology
   • https://doi.org…91.2021.2019053

4. open defecation-free(English)

   • communities revert to OD or partially use latrines
   • OD, U5C, CLTS
   • Hygiene, Pediatrics
   • https://doi.org…heh.2023.114160