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1. A construction or pronunciation produced by mistaken analogy with standard usage out of a desire to be correct, as in the substitution of I for me in on behalf of my parents and I.
2. The production of such a construction or pronunciation.
(Linguistics) a mistaken correction to text or speech made through a desire to avoid nonstandard pronunciation or grammar: 'between you and I' is a hypercorrection of 'between you and me'.
hy•per•cor•rec•tion(ˌhaɪ pər kəˈrɛk ʃən)
the use of an inappropriate pronunciation, grammatical form, or construction, as between you and I, resulting usu. from an effort to replace incorrect or seemingly incorrect forms with correct ones.