Home › Words › O › onesomeonesome/ˈwʌnsəm/onesome · noun — A solitary person or thing; a "group" of one.Definition from Wiktionary (CC BY-SA 3.0).onesome is pronounced /ˈwʌnsəm/.EtymologyFrom one + -some.nounA solitary person or thing; a "group" of one.e.g.“When Joe and Suzie left, the threesome became a onesome.”Definitions & examples from Wiktionary (CC BY-SA 3.0).