(organic chemistry) A system for naming organic compounds in which a functional group is used either as a prefix or a suffix to the name of a parent compound e.g. trinitrotoluene or benzenesulfonic acid

(philosophy) Synonym of indiscernibility of identicals

(sports) A rule in some sports that allows players to enter and leave the game for other players many times during the course of the game, and for coaches to bring in and take out players an unlimited number of times.

plural of free substitution

plural of blood substitution

(rugby) A temporary substitution for a visibly-bleeding player who must leave the field of play for first-aid treatment.

plural of substitution cipher

(theology) The theory of atonement which holds that Jesus died on the Cross in place of human sinners.

(calculus) A method of integration in which a function of a variable is replaced with a new variable, conventionally called u.

(programming) The semantics-free search and replacement of one sequence of text characters with another.