the act of putting one thing or person in the place of another: "he sent Smith in for Jones but the substitution came too late to help"

substitute a person or thing for (another that is broken or inefficient or lost or no longer working or yielding what is expected)

put in the place of another; switch seemingly equivalent items

take the place or move into the position of

(law) the replacement of one obligation by another by mutual agreement of both parties; usually the replacement of one of the original parties to a contract with the consent of the remaining party

replacing a pitcher in baseball

act of replacing one person or thing by another especially one held to be superior

act of taking the place of another especially using underhanded tactics