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Dictionary

sub•sti•tute

Pronunciation: (sub'sti-tOOt", -tyOOt"), [key]
—n., v., -tut•ed, -tut•ing,
—adj.

—n.
1. a person or thing acting or serving in place of another.
2. (formerly) a person who, for payment, served in an army or navy in the place of a conscript.
3. Gram.a word that functions as a replacement for any member of a class of words or constructions, as do in He doesn't know but I do.

—v.t.
1. to put (a person or thing) in the place of another.
2. to take the place of; replace.
3. Chem.to replace (one or more elements or groups in a compound) by other elements or groups.

—v.i.
to act as a substitute.

—adj.
1. of or pertaining to a substitute or substitutes.
2. composed of substitutes.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

substituent

substitution cipher

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