Exact historical dictionary sense
Secret in Webster's 1913 dictionary
The 1913 record labels secret as adjective. Its source-bounded etymology and selected historical definition appear below.
[F. secret (cf. Sp. & Pg. secreto, It. secreto, segreto), fr. L. secretus, p. p. of secernere to put apart, to separate. See Certain, and cf. Secrete, Secern.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "secret" is labeled adjective. Its etymology is recorded as: "[F. secret (cf. Sp. & Pg. secreto, It. secreto, segreto), fr. L. secretus, p. p. of secernere to put apart, to separate. See Certain, and cf. Secrete, Secern.]" The selected historical definition says: "Hidden; concealed; as, secret treasure; secret plans; a secret vow."