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a. The act or an instance of transforming: her difficult transformation of the yard into a garden.
b. The state of being transformed: impressed by the transformation of the yard.
2. A marked change, as in appearance or character, usually for the better: recent transformations in the format of the publication.
a. Replacement of the variables in an algebraic expression by their values in terms of another set of variables.
b. A mapping of one space onto another or onto itself.
4. Linguistics An operation or rule that changes one linguistic structure (especially a syntactic structure) into another, as by the merger, relocation, or deletion of one of its constituents.
a. The change undergone by an animal cell upon infection by a cancer-causing virus.
b. The introduction of DNA from one cell into another by means of a bacteriophage or one of a variety of chemical or physical methods.
trans′for·ma′tion·al, trans·form′a·tive (-fôr′mə-tĭv) adj.