Linguistics. 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.Compare grapheme.
writing or a signature inscribed by one person for another, as distinguished from autograph.
a deed or other legal document not in the writing of any of the persons who are party to it.
Origin of allograph
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a document written by a person who is not a party to it
a signature made by one person on behalf of anotherCompare autograph
linguistics any of the written symbols that constitute a single graphemem and M are allographs in the Roman alphabet
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper