- (adv.) By limitation to the number one; for one time; not twice nor any number of times more than one.
- (adv.) At some one period of time; -- used indefinitely.
- (adv.) At any one time; -- often nearly equivalent to ever, if ever or whenever; as, once kindled, it may not be quenched.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). once. Retrieved September 20, 2026, from http://smartdefine.org/once/definitions/2038798 |
| Chicago | Webster's. 2011. "once" http://smartdefine.org/once/definitions/2038798 (accessed September 20, 2026). |
| Harvard | Webster's 2011, once, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/once/definitions/2038798>. |
| MLA | Webster's. "once" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/once/definitions/2038798> |