Other forms: apieces
The adverb apiece means "for each" or "to each." If your grandmother gives you and your cousins ten dollars apiece, she hands each of you a ten dollar bill.
When you sell cookies at a bake sale for a dollar apiece, every individual cookie costs one dollar. And if two competing baseball teams have eleven wins apiece, it means that they're tied for the season so far — they've each won eleven games. Apiece, first used in the 1500s, was a contraction of a pece, which was almost always used to talk about coins or items for sale.