Exact historical dictionary sense
Single in Webster's 1913 dictionary
The 1913 record labels single as adjective. Its source-bounded etymology and selected historical definition appear below.
[L. singulus, a dim. from the root in simplex simple; cf. OE. & OF. sengle, fr. L. singulus. See Simple, and cf. Singular.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "single" is labeled adjective. Its etymology is recorded as: "[L. singulus, a dim. from the root in simplex simple; cf. OE. & OF. sengle, fr. L. singulus. See Simple, and cf. Singular.]" The selected historical definition says: "One only, as distinguished from more than one; consisting of one alone; individual; separate; as, a single star."