Definition of semiannual in US English:



  • 1Occurring twice a year; half-yearly.

    ‘their semiannual meetings’
    • ‘Today was a day of meetings, which seems to be the usual round at the moment, although this afternoon was unusual in that it was the semi-annual programme review.’
    • ‘The sentiment seems to be widespread among the bishops who participated in the semi-annual meeting, held this past June in Englewood, a few miles from Denver, Colorado.’
    • ‘She has recently taken on what she regards as a potentially bigger project in Ten by Ten magazine, a semi-annual glossy that first reached the shelves in 1999.’
    • ‘And while New York designers scramble to stitch their lines for the semi-annual previews, the autumn clothes unveiled yesterday are for ladies who can afford to take it slowly.’
    • ‘However, the rate of solved crimes has also increased, according to data from the semi-annual report of the Sofia Directorate of the Interior Ministry.’
    • ‘He introduced a proposal for a semi-annual sales tax holiday, and supported extending North York's sidewalk snow removal program to the entire megacity (a program that's now in question because its done so much damage to lawns).’
    • ‘And why has no one questioned the truthfulness of the semi-annual income reports required of all cadres?’
    • ‘Holmes will present research on his underwater listening device in Vancouver on May 20 at the semi-annual meeting of the Acoustical Society of America.’
    • ‘Membership upgrades are available on an annual, semi-annual, or quarterly basis.’
    • ‘The Organisation for Economic Cooperation and Development said in its semi-annual Economic Outlook that the Bank of England should raise its key rate to 5.5% next year to head off inflation.’
    • ‘But 91% of the elderly got eye exams and 58% the semi-annual foot inspections.’
    • ‘I myself am thinking that my semi-annual haircut can probably wait another couple of weeks, so I'll be hitting her tip jar as soon as I get paid again on Friday.’
    • ‘And I'm having my semi-annual despair-over-my-lack-of-a-love-life freakout, too.’
    • ‘Keeneland's board of directors resolved to support a national medication policy at its semi-annual meeting on Wednesday.’
    • ‘Now I'm off to our semi-annual local Earth Day cleanup and How To Save the Earth brainstorming and eating and drinking and playing in the woods gathering.’
    • ‘The semi-annual distribution of Taddle Creek occurs every June and December and can be found at various book and magazine stores across Canada.’
    • ‘Prior to the semi-annual meetings, board members are provided advanced copies of a Technical Munitions Safety Study.’
    • ‘Jack is the president of our community association, a pretty laissez-faire group that holds semi-annual picnics and an annual meeting.’
    • ‘Through semi-annual interviews, researchers collected data on drug use history, sociodemographics, and drug use and sexual behavior within the last 6 months.’
    • ‘The Photographer has emailed to ask if I'd like to have our semi-annual get-together, wherein he informs me of the many things I have in common with Satan, over drinks.’
    1. 1.1 (of a plant) living for half a year only.
      • ‘It is fast growing, and can be kept as a container or semiannual plant.’


  • A semiannual plant.

    • ‘In your next entry, please let us know if now is the proper time of the year for planting annuals or semiannuals.’
    • ‘Last fall's Garden Guide was just honored at the Western Publications Association's annual Maggie Awards ceremony in Los Angeles as the best Western publication in the annuals and semiannuals category.’
    • ‘Remember, if your basic garden structure doesn't give you enough colour to enjoy, there are plenty of annuals or semiannuals that will!’