Substitution Definition

sŭbstĭ-to͝oshən, -tyo͝o-
substitutions
noun
substitutions
The act or an instance of substituting.
American Heritage
The state of being substituted.
American Heritage
The substituting of one person or thing for another.
Webster's New World
The selection of an individual or a thing to take the place of another; the process of one thing taking another’s place or one person acting in lieu of another.
Webster's New World Law

(chemistry) (especially in organic chemistry) The replacement of an atom, or group of atoms, in a compound, with another.

Wiktionary

Other Word Forms of Substitution

Noun

Singular:
substitution
Plural:
substitutions

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