Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Happening twice each year; semiannual.
  • adj. Occurring every two years; biennial.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Occurring twice a year; half-yearly; semiannual, twice-yearly.
  • adj. Occurring every two years; biennial.
  • n. Something occurring twice each year.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Occurring twice a year; half-yearly; semiannual.

from The Century Dictionary and Cyclopedia

  • Occurring twice a year: arbitrarily distinguished from biennial (which see).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. occurring or payable twice each year

Etymologies

bi- +‎ annual (Wiktionary)

Examples

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