A variant form of a grapheme as `m' or `M'

• A signature made by one person for another

WordNet Word definitions in WordNet
n. a variant form of a grapheme as `m' or `M' a signature made by one person for another

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Allograph \Al"lo*graph\, n. [Gr. ? another + -graph.] A writing or signature made by some person other than any of the parties thereto; -- opposed to autograph .

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"writing made by another person," by 1916 (implied in allographic ), from allo- + -graph "something written."

Wiktionary Word definitions in Wiktionary
n. 1 A variant form of a letter (or other grapheme) 2 A signature made by one person for another (compare autograph)