1 turn, round, time, occasion, spell, period, session:
He's just got over a bout of pneumonia.
2 chance, spree, stint, opportunity, innings:
We had long planned this bout of shopping.
3 contest, match, boxing-match, prizefight, meet, set-to, struggle, encounter, engagement; duel:
A bout has been arranged between the heavyweight champion of the world and a challenger from Puerto Rico.