Vicarious; delegated.

Taking the place, or performing the functions, of another.

= succedaneous, adj.

That is a surrogate; taking the place of or standing for something else; representative. Now esp. in contexts where the substitute is intended to…

That takes or supplies the place of another thing or person; substituted instead of the proper thing or person.

Taking, or serving in, the place of something else; acting as a succedaneum or substitute. Const. to (unto).

That takes the place of something; that tends to replace something else; used as a substitute. Also: that admits of being replaced with a substitute.

= substitutional, adj.

Having the quality or character of supersession; taking the place of something or someone displaced; = supersessive, adj.

That is a replacement for something; that is a substitute.

Having the quality or character of supersession; taking the place of something or someone displaced; = supersessory, adj.

Designating organizations, structures, etc., built or instituted to substitute for or duplicate those existing in an emergency or to fulfil…

that may be substituted for anything else.