afternoon UK /ˌɑːf.təˈnuːn/US /ˌæf.tɚˈnun/noun 3adverb 1exclamation 1forms 1 noun3 •the part of the day between lunch and eveningHere the stripped panelling was warmly gold and the pictures, mostly of the English school, were mellow and gentle in the afternoon light. — 1963 •(figurative) The later part of anything, often with implications of decline. •(informal) A party or social event held in the afternoon. adverb1 •(no longer used) In the afternoon.Afterwards […] they adjourned the court till two in the afternoon, and so went to prayers. Afternoon they called over the names of the rest of the college, demys, chaplains, &c. — 1688 exclamation1 •Ellipsis of good afternoon. formsafternoons