Substitute

Substitute may mean:

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In sport:

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A person who replaces an exiting competitor during the course of a game, as permitted by the laws of the game. Such replacements are generally made for tactical reasons, or when a player becomes tired or injured.

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• Substitute (cricket)
• Substitute (soccer)

Other uses:

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• Substitute (character), the hexadecimal character 1A in the ASCII character set.
• Substitution property of equality, an operation used in mathematics.
• Substitute (song), a 1966 song by The Who appearing on the album Meaty Beaty Big and Bouncy