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ceathair
  1.  four(n)
Usage
  1. ar a ceathair a chlog = at 4 o'clock(referring to time):
  2. a dó faoina dó sin a ceathair = two times two equals four
  3. níl seacht inroinnte ar a ceathair = four into seven won't go
  4. lasca, trípholach nó ceathairpholach, ar féidir leo lascadh dúbailte a dhéanamh = switches, three- or four-pole, double breaking