Tweener

But a half-dozen other movies geared toward the teenage and 'tween girl market – 'tweeners are girls from 8 to 12 years old – have failed to make more than a slight dent at the box office.

Source: wiktionary

I assigned one of my groups of heart patients the task of sorting a hundred art reproductions into three piles: beautiful, in between, and ugly. The five men sat down to begin work. The first few paintings were easily classified and group decision was rapid. As they progressed, however, one of the men commented, “I think this one is sort of a tweener.”

Source: wiktionary

Right now, Mr. Ryan's attention is on the "tweeners," savings and loans that are not obviously "brain dead," in regulatory parlance, and that at the same time are not clear winners – a group with $247 billion in assets.

Source: wiktionary

So BMW has conjured a tweener — a roomier hatchback on platform shoes, with standard all-wheel drive — to attract customers who crave the 3 Series’ performance but need more utility to close the deal.

Source: wiktionary