Tweenienoun
(informal) A child who is not quite old enough to be a teenager; a tweenager.
Tweenienoun
(tennis) A shot that is hit between the legs; a tweener.
Tweenienoun
(slang) A 650-watt fresnel motion picture lighting instrument first manufactured by the Mole-Richardson Company.
Teenienoun
A sixteenth of a dollar, a unit in which stocks could formerly be traded.