noun

1. a male ruler of a nation or state usually called a kingdom; male sovereign, limited or absolute; monarch
2. 1. a man who is supreme or highly successful in some field an oil king
   2. something supreme in its class
3. a playing card with a conventionalized picture of a king on it
4. Checkers a piece that has been crowned and can thus move backward as well as forward
5. Chess the chief piece, which can move one square in any direction

Etymology: ME < OE cyning, akin to ON konungr, OHG kuning < Gmc *kuningaz < *kunja-, kin + -ing-, belonging to: prob. basic sense, either “head of a kin” or “son of noble kin”

adjective

transitive verb