Pronunciation: (hī"pur-ku-rek'shun), [key]
1. the substitution, in an inappropriate context, of a pronunciation, grammatical form, or usage thought by the speaker or writer to be appropriate, resulting usually from overgeneralizing in an effort to replace seemingly incorrect forms with correct ones, as the substitution of between you and I for between you and me, by analogy with you and I as the subject of a sentence.
2. the form so substituted. Cf. hyperform, hyperurbanism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.