Definition from Wiktionary, the free dictionary
posit (plural posits)
Usage notes 
- (for meaning #2) Started by USAF Fighter pilots when needing to know the position of a wingman. I.e. Lead pilot would say "2-posit" and #2 would reply: "5 o'clock high". Also in use in commercial airlines. Some pilots respond "cleared into posit and hold" when cleared on to the runway.
- Assume the existence of; to postulate.
- Propose for consideration or study; to suggest.
- Put (something somewhere) firmly.