Exact historical dictionary sense
October in Webster's 1913 dictionary
The 1913 record labels october as noun. Its source-bounded etymology and selected historical definition appear below.
WEBSTER 1913noun
October
[L., the eighth month of the primitive Roman year, which began in March, fr. octo eight: cf. F. Octobre. See Octave.]
Cross-verified historical senseHeadwordoctober
Part of speechnoun
Historical etymology[L., the eighth month of the primitive Roman year, which began in March, fr. octo eight: cf. F. Octobre. See Octave.]
Selected historical definitionThe tenth month of the year, containing thirty-one days.
Signed record IDwebster1913-october-noun-6a11da537fb6
Source locatorCIDE.O, paragraph 994; Gutenberg eBook 665
Quick answer
In Webster's Revised Unabridged Dictionary (1913), "october" is labeled noun. Its etymology is recorded as: "[L., the eighth month of the primitive Roman year, which began in March, fr. octo eight: cf. F. Octobre. See Octave.]" The selected historical definition says: "The tenth month of the year, containing thirty-one days."