occasion /əˈkeiʒən/ n. ［c］1. 场合，时刻，日子：on a public occasion 在公开场合；celebrate an occasion with a dinner 设宴庆祝某个日子 2.时机，机会：choose one’s occasion 选择时机；offer a splendid occasion 提供极好的机会 on occasion(s) 有时，偶尔：He has, on occasion, made a small mistake.他偶尔要犯小错误。
［辨析］与chance, opportunity, possibility辨见opportunity
occasional /əˈkeiʒənəl/ adj. 间或发生的，偶尔的：be quite occasional 相当偶然；like an occasional glass of wine 偶尔喝两杯酒；make occasional trips to a museum 偶尔参观一个博物馆
