substitute

Meanings

Verb

• To use in place of something else, with the same function.
• To use X in place of Y.
• To use Y in place of X; to replace X with Y.
• To remove (a player) from the field of play and bring on another in his place.
• To serve as a replacement (for someone or something).

Noun

• A replacement or stand-in for something that achieves a similar result or purpose.
• A player who is available to replace another if the need arises, and who may or may not actually do so.
• One who enlists for military service in the place of a conscript.

Origin

• From Middle English substituten, from Latin substitutus, past participle of substituō.