Definitions
1.nounThe most important person, the one who is in charge.
2.nounSomeone who is top of a ranking, who is ranked first.
3.nounOneself, being considered foremost, as by an egoist.
4.nounUrine; urination.
5.nounThe single that has sold the most in a given period.
6.nounThe main goalkeeper of a team, so-called because they wear the number 1 on the back of their kit.
7.nounThe batsman who opens the batting.
8.nounA first lieutenant.
9.nounA large town where theatrical performances may expect to achieve success.
10.adjectiveFirst; foremost; best, often used after its headword."Commuting to work is the number one reason to own a car."