Exact historical dictionary sense
Primary in Webster's 1913 dictionary
The 1913 record labels primary as adjective. Its source-bounded etymology and selected historical definition appear below.
[L. primarius, fr. primus first: cf. F. primaire. See Prime, a., and cf. Premier, Primero.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "primary" is labeled adjective. Its etymology is recorded as: "[L. primarius, fr. primus first: cf. F. primaire. See Prime, a., and cf. Premier, Primero.]" The selected historical definition says: "First in order of time or development or in intention; primitive; fundamental; original."