Definitions for "En passant"
Keywords:  pawn, passant, chess, fifth, capture
In passing; in the course of any procedure;
of the taking of an adverse pawn which makes a first move of two squares by a pawn already so advanced as to threaten the first of these squares. The pawn which takes en passant is advanced to the threatened square.
A special type of pawn move. It is rarely known by non-tournament players.