Informal a child who is not yet a teenager, typically one 8 to 12 years old
Origin of tweenblend of between and teen
Old Poet. between
Origin of 'tweenMiddle English twene, aphetic for atwene, betwene, between
A child between middle childhood and adolescence, usually between 8 and 12 years old. Also called tweener.
Origin of tweenBlend of teen1 and between.