1375-1425;late Middle English < Medieval Latingraduātus (past participle of graduāre), equivalent to grad(us) grade, step + -u- thematic vowel + -ātus-ate1
In the sense “to receive a degree or diploma” graduate followed by from is the most common construction today: Her daughter graduated from Yale in 1981. The passive form was graduated from, formerly insisted upon as the only correct pattern, has decreased in use and occurs infrequently today: My husband was graduated from West Point last year. Even though it is condemned by some as nonstandard, the use of graduate as a transitive verb meaning “to receive a degree or diploma from” is increasing in frequency in both speech and writing: The twins graduated high school in 1974.
late 15c., from M.L. graduatus, pp. of graduari "to take a degree," from L. gradus "step, grade" (see grade). The abbreviated form grad is attested from 1871. The verb is 1580s (trans.), 1807 (intrans.).