Home › Words › T › tweennesstweennesstweenness means the quality of being a tween.Among words judged in Lexicurio's Arena, tweenness ranks #32,731 of 42,747 for Qualifying.EtymologyFrom tween + -ness.nounThe quality of being a tween.Definitions & examples from Wiktionary (CC BY-SA 3.0).