af·ter·noon / ˌaftərˈnoōn/ • n. the time from noon or lunchtime to evening: I telephoned this afternoon I'll be back at three in the afternoon she worked on Tuesday afternoons | [as adj.] the afternoon sunshine. ∎ this time on a particular day, characterized by a specified type of activity or particular weather conditions: an afternoon of drama.• adv. (afternoons) inf. in the afternoon; every afternoon.