tween vs tweenie

tween

noun
  • A child, especially a girl, in the age range between middle childhood and adolescence, normally between eight and thirteen years of age. 

  • An action of tweening (inserting frames for continuity); a sequence of frames generated by tweening. 

  • a number or age in the twenties (plural only), or a person of that age 

verb
  • To generate intermediate frames in an animated sequence so as to give the appearance of smooth movement. 

adj
  • Of or having to do with tweenagers. 

tweenie

noun
  • A child who is not quite old enough to be a teenager; a tweenager. 

  • A shot that is hit between the legs; a tweener. 

  • A 650-watt fresnel motion picture lighting instrument first manufactured by the Mole-Richardson Company. 

How often have the words tween and tweenie occurred in a corpus of books? (source: Google Ngram Viewer )