<p><strong>Noun</strong></p><ul><li>an official, as in tennis and soccer, who assists the referee</li><li>Football: an official who marks the distances gained and lost in the progress of play and otherwise assists the referee and field judge</li><li>Ice Hockey: either of two officials who assist the referee by watching for icing, offside, and substitution violations and fouls, and by conducting face-offs</li></ul>