doing the work of two or more usually separate parts

an all-in-one printer with scanner, copier, and fax 集扫描、复印和传真于一体的多功能打印机

a piece of clothing that covers the whole body rather than being divided into a separate top and bottom part

She wears a pink Lycra all-in-one for her aerobics class. 她参加有氧健身班时穿一件粉色莱卡连身服。