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The Collaborative International Dictionary of English v.0.48 (gcide)

Line-up \Line"-up`\, Lineup \Line"up`\ (l[imac]n"[u^]p), n.
1. The members of a team who are scheduled to play a game.
[PJC]

2. Specifically: The formation of football players before the
start or a restart of play.
[PJC]

3. Specifically: (baseball) a list of batters in the order in
which they will bat. [WordNet sense 1]

Syn: batting order, card, lineup.
[WordNet 1.5]

4. Hence: any arrangement of persons (rarely, of things),
esp. when having a common purpose or sentiment; as, the
line-up at a ticket-office window; the line-up of
political factions. [Colloq.]
[PJC]

5. A group of persons including a suspect in a police
investigation, arranged so as to be observed by a witness,
who is requested to identify the perpetrator, if he/she is
present in the group. Such an identification may be used
as evidence of guilt of the suspect. Also called a {police
lineup}. [WordNet sense 2]
[PJC]