Exact historical dictionary sense
Double in Webster's 1913 dictionary
The 1913 record labels double as adjective. Its source-bounded etymology and selected historical definition appear below.
[OE. doble, duble, double, OF. doble, duble, double, F. double, fr. L. duplus, fr. the root of duo two, and perh. that of plenus full; akin to Gr. diplo`os double. See Two, and Full, and cf. Diploma, Duple.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "double" is labeled adjective. Its etymology is recorded as: "[OE. doble, duble, double, OF. doble, duble, double, F. double, fr. L. duplus, fr. the root of duo two, and perh. that of plenus full; akin to Gr. diplo`os double. See Two, and Full, and cf. Diploma, Duple.]" The selected historical definition says: "Twofold; multiplied by two; increased by its equivalent; made twice as large or as much, etc."