Oncer
noun, slang ·Moderate ·College level
Definitions
- 1 A one-pound note. historical, informal
"On whatever point Jane’s eyes rested, through whichever line her gaze ran, she saw cheques being signed, credit-card counterfoils being scrawled across, standing orders being arranged, and cash – wholesome dosh, ponies, monkies, oncers, coins of the realm – flowing around like mercury, like some element."
- 2 A fan of the television series Once Upon a Time. slang
"And fun because, well, he gets to interact with “Oncers” at fan events like PaleyFest and Comic Con […]"
- 3 A person who does something once. poetic
"Could he but once see Nature as / In truth she is for ever, / What oncer would not fall in love?"
- 4 A single sexual encounter between two individuals, a one-night stand. informal
- 5 A person with whom one shares a single sexual encounter, a one-night stand. informal
Example
More examples"On whatever point Jane’s eyes rested, through whichever line her gaze ran, she saw cheques being signed, credit-card counterfoils being scrawled across, standing orders being arranged, and cash – wholesome dosh, ponies, monkies, oncers, coins of the realm – flowing around like mercury, like some element."
Etymology
From once + -er (relational suffix) or + -er (occupational suffix).
From once + -er.
Related phrases
More for "oncer"
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.