n.
Function: verb
Inflected Form: -tut · ed ; -tut · ing
Date: circa 1594
transitive verb
1 a : to put or use in the place of another b : to introduce (an atom or group) as a substituent also : to alter (as a compound) by introduction of a substituent <a substituted benzene ring>
2 : to take the place of : REPLACE
intransitive verb : to serve as a substitute