- ☆ the first, usually the very best, quality or grade
Used by arrangement with John Wiley & Sons, Inc.
- One that is first in rank, order, or importance.
- Slang One's own interests; oneself: watching out for number one.
- Informal a. The act of urinating.b. Urine.
- First in rank, order, or importance: the number one team in the nation; our number one problem.
- Foremost in quality; first-rate: bought some number one farmland.