What is "allograph"

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.

"writing made by another person," by 1916 (implied in allographic), from allo- + -graph "something written."

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

1. n. a variant form of a grapheme as `m' or `M'

2. a signature made by one person for another