allograph: Meaning and Definition of

al•lo•graph

1. a variant form of a grapheme that is in complementary distribution or free variation with another form of the same grapheme, as t and T or n in run and nn in runner; an orthographic contextual variant. Cf. grapheme.
2. writing or a signature inscribed by one person for another, as distinguished from autograph.
3. a deed or other legal document not in the writing of any of the persons who are party to it.