tenth month of the lunar calendar
Obsolete and rare term. Used in classical Japanese to refer to the tenth month of the lunar calendar, roughly corresponding to November in the modern calendar. See also 孟冬 and 神無月.
In classical texts, 上冬 refers to the month also known as 神無月.
The term is composed of 上 (upper, early) and 冬 (winter), reflecting the early winter period in the lunar calendar. The exact historical derivation is uncertain.