NUMBER ONE

(1) {n. phr.}, {informal} Yourself; your own interests; your private or selfish advantage. Usually used in the phrase "look out for number one". * /He was well known for his habit of always looking out for number one./ (2) {adj. phr.} 1. Of first rank or importance; foremost; principal. * /He is easily America's number one golfer./ 2. Of first grade; of top quality; best. * /That is number one western steer beef./