Bimonthly is a term defining frequency. It generally means "every two months", especially in commercial and British usage, based on the prefix Bi- meaning 2. It thus contrasts with semimonthly which means "two times every month".[1][2] It is also still used, though more rarely, to have the same meaning as semimonthly, causing considerable confusion.[3]

The corresponding concepts are not confused in, for example, French, with bimestriel meaning every 2 months, and bimensuel meaning twice a month.[4]


  1. "Bimonthly definition and meaning, Collins English Dictionary".
  2. "Does 'bimonthly' mean 'twice a month'..., Oxford Dictionaries". Oxford Dictionaries, English.
  3. "Definition of BIMONTHLY".
  4. Cazorla, Nathalie McAndrew; Williams, Stuart (2013). Manual of Business French. Routledge. p. 334. ISBN 9781136166518.
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