What is the Latin word for endorse?

The usual Latin words for “endorse” are chīrographum, syngrapha, scrībō. The right choice depends on the sense; see the distinctions below.

English → Latin

“endorse” in Latin

chīrographumone's handwriting; autograph; manuscript syngraphapromissory note, IOU scrībōto write

The English word endorse itself goes back to Latin dorsum, through dossum.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

endorse

a bill, *chirographum or syngrapham inscribere; or litterally, in tergo (syngraphae, chirographi, etc.) scribere (after scriptus et in tergo, Juv.) or *suo quoque chirographo cavere de re (i. e., by my note of hand, in addition to the other person’s: chirographo cavere de re, Suet., Cal., 12); or *suo quoque chirographo obligare se ad praestandum (after Dig., chirographo obligare se ad praestandum). [On difference between syngrapha and chirographum, Vid: “Note of HAND.”

Quick answer

What is the Latin word for endorse?: The usual Latin words for “endorse” are chīrographum, syngrapha, scrībō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.