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From once.



oncer ‎(plural oncers)

  1. (informal, historical) A one-pound note.
    • 1993, Will Self, My Idea of Fun:
      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. (poetic) A person who does something once.
    • 1944, W. H. Auden, The Sea and the Mirror: A Commentary on Shakespeare's The Tempest, Part 1. Prospero to Ariel:
      Could he but once see Nature as / In truth she is for ever, / What oncer would not fall in love?