from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An extraordinary individual.
- n. A small marble of little worth in children's games.
- n. A conker that has won one match.
from The Century Dictionary and Cyclopedia
- n. One indeed; one of the best; a person possessing some unique characteristic, particularly some special skill, or indefatigable in some occupation or pursuit; a good hand; an adept or expert.
one + -er (Wiktionary)