CHECKER

I. noun see: check Date: 14th century chessboard , a square or spot resembling the markings of a ~board, a piece in ~s, II. transitive verb (~ed; ~ing) Date: 15th century 1. to variegate with different colors or shades, to vary with contrasting elements or situations, to mark into squares, III. noun Date: 1535 one that checks , an employee who checks out purchases in a self-service store