Substitute

sub′sti-tūt, v.t. to put in place of another.— n. one who, or that which, is put in place of another.— adj. put instead of another.— n. Substitū′tion , act of substituting or putting in place of another: ( Shak. ) the office of a substitute: the use of one word for another, syllepsis: ( alg. ) the replacing one quantity by another which is equal to it but differently expre ed: ( chem. ) the replacement of one or more equivalents of a body by a like number of equivalents of another.— adjs. Substitū′tional , Substitū′tionary .— adv. Substitū′tionally .— adj. Sub′stitūtive . [L. substituĕre , -ūtum — sub , under, statuĕre , to set.]