Definition of "infil"

infil

noun
countable and uncountable, plural infils
1. (chiefly military) Clipping of infiltration (“the act of going into a place”).
  Quotations
  After all this information has been gained, the troops and teams start conducting rehearsals on hitting the target. What this means is that they will conduct Full Mission Profiles (FMP). This covers every aspect of the operation — the infil to the target, actions on the objective, and then exfil from the target location back to the staging area.
  2019 November 22, Brian Gilly, “Gilly: When Army Special Operations gets ‘the call’ for battle”, in Sarasota Herald-Tribune‎