Exact historical dictionary sense
Motor in Webster's 1913 dictionary
The 1913 record labels motor as noun. Its source-bounded etymology and selected historical definition appear below.
[L., fr. movere, motum, to move.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "motor" is labeled noun. Its etymology is recorded as: "[L., fr. movere, motum, to move.]" The selected historical definition says: "One who, or that which, imparts motion; a source of mechanical power."