substitute🔊

To use in place of something else, with the same function.

(in the phrase "substitute X for Y") To use X in place of Y.

(in the phrase "substitute X with/by Y") To use Y in place of X; to replace X with Y.

(sports) 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).

A replacement or stand-in for something that achieves a similar result or purpose. +

A substitute teacher.

(sports) A player who is available to replace another if the need arises, and who may or may not actually do so.

(historical) One who enlists for military service in the place of a conscript.

(economics) (substitute good)