What is "enallage"

Enallage \E*nal"la*ge\, n. [L., fr. Gr. ? an exchange, fr. ? to exchange; ? in + ? to change.] (Gram.) A substitution, as of one part of speech for another, of one gender, number, case, person, tense, mode, or voice, of the same word, for another.

n. 1 (context uncountable rhetoric English) Transformation from one grammatically correct form to another. 2 (context uncountable rhetoric English) The substitution of one grammatical form for another that violates a grammatical rule.

n. a substitution of part of speech or gender or number or tense etc. (e.g., editorial `we' for `I')

Enallage (; , enallagḗ, "interchange") is a figure of speech used to refer to the use of tense, form, or person for a grammatically incorrect counterpart.