Definition of I-formation in English:



  • 1American Football
    An offensive formation in which the quarterback and two or more running backs (typically a fullback and a tailback) form a line behind the ball, at right angles to the line of scrimmage.

  • 2Tennis
    A formation in doubles matches in which the server stands close to the centre mark on the baseline and his or her partner stands close to the centre service line.


1950s; earliest use found in The Newport Daily News.