Definitions from Wiktionary (substitute)

▸ verb:  (transitive) To use in place of something else, with the same function.
▸ verb:  (transitive, in the phrase "substitute X for Y") To use X in place of Y.
▸ verb:  (transitive, formerly proscribed, in the phrase "substitute X with/by Y") To use Y in place of X; to replace X with Y.
▸ verb:  (transitive, sports) To remove (a player) from the field of play and bring on another in his place.
▸ verb:  (intransitive) To serve as a replacement (for someone or something).
▸ noun:  A replacement or stand-in for something that achieves a similar result or purpose.
▸ noun:  A substitute teacher.
▸ noun:  (sports) A player who is available to replace another if the need arises, and who may or may not actually do so.
▸ noun:  (historical) One who enlists for military service in the place of a conscript.
▸ noun:  (economics) Abbreviation of substitute good. [(economics) a good that a consumer perceives as similar to another good, which decreases the demand for that other good]
▸ Also see substitute

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