a conventional expression of greeting or farewell used during the day
WordReference Random House Unabridged Dictionary of American English © 2026
good′ day′,
- a conventional expression used at meeting or parting during the daytime.
- Middle English 1175–1225
Collins Concise English Dictionary © HarperCollins Publishers::
'good day' also found in these entries (note: many are not synonyms or translations):