Definition

1. Adjective:
   • Occurring twice a year: "semi-annual" describes something that happens every half-year, or two times within a twelve-month period.
   • Lasting half a year: It can also refer to something that has a duration of six months.

Usage Examples

• (A report issued twice per year.)
• (Meetings that occur every six months.)
• (A subscription lasting half a year.)

Advanced Usage

• "semi-annual basis": a phrase indicating that an event or action occurs every six months.

  • Interest is calculated on a semi-annual basis. (Interest is computed twice yearly.)

• "semi-annual event": an event scheduled to happen twice a year.

  • The semi-annual sale attracts many shoppers. (A sale occurring in spring and autumn.)

Variants and Related Words

• Semi-annually (adverb): in a manner that occurs twice a year.

  • The magazine is published semi-annually. (It comes out every six months.)

• Annual (adj): occurring once a year.

  • Compare with annual, which happens only once per year. (Annual is a related term with a different frequency.)

Synonyms

• Biannual: occurring twice a year (often used interchangeably with "semi-annual").

  • The biannual conference is held in March and September. (Synonym for semi-annual event.)

• Half-yearly: happening every six months.

  • The half-yearly audit checks the accounts. (Synonym for semi-annual review.)

Related Idioms

• "On the half-year": a less common phrase meaning every six months.
  • Payments are due on the half-year. (Payments are required twice annually.)

Notes on Usage

• "Semi-annual" is often hyphenated, but "semiannual" (without hyphen) is also accepted in formal writing. The hyphen helps clarify the meaning of "half" (semi) combined with "annual" (yearly).