Exact historical dictionary sense
Adult in Webster's 1913 dictionary
The 1913 record labels adult as adjective. Its source-bounded etymology and selected historical definition appear below.
[L. adultus, p. p. of adolescere, akin to alere to nourish: cf. F. adulte. See Adolescent, Old.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "adult" is labeled adjective. Its etymology is recorded as: "[L. adultus, p. p. of adolescere, akin to alere to nourish: cf. F. adulte. See Adolescent, Old.]" The selected historical definition says: "Having arrived at maturity, or to full size and strength; matured; as, an adult person or plant; an adult ape; an adult age."