Free reference guides to English Grammar
Practical English Usage
Grammar terms and writing

Reference Desk
Home
English Grammar
Practical English Usage
Grammatical Terms
English Writing
English speaking
Vocabulary

Site Info
About
Recommended Links
Link to Us
Site Map
Terms of Use
Advertise with Us

 

 

Time periods

  • Bicentennial: A period of 200 years
  • Biennial: A period of 2 years
  • Century: A period of 100 years
  • Decade: A period of 10 years
  • Centennial: Every 100 years
  • Decennial: Every 10 years
  • Leap year: A period of 366 days
  • Millennium: A period of 1,000 years
  • Month: A period of 28-31 days
  • Olympiad: Every 4 years
  • Quadrennial: Every 4 years
  • Quadricentennial: Every 400 years
  • Quincentennial: Every 500 years
  • Septennial: Every 7 years
  • Sexcentenary: A period of 600 years
  • Sexennial: Every 6 years
  • Tercentenary: A period of 300 years
  • Triennial: Every 3 years
  • Vicennial: Every 20 years
  • Week: 7 days
  • Year: 365 days
  • Time intervals

  • Annual: occurring every year
  • Biannual: occurring twice a year
  • Bimonthly: occurring every two months or twice a month
  • Biweekly: every two weeks or twice a week
  • Diurnal: daily, of each day
  • Perennial: lasting through a year or several years
  • Semi-annual: occurring twice a year
  • Semi-diurnal: twice a day
  • Semi-weekly: twice a week
  • Trimonthly: every three months
  • Triweekly: every three weeks or three times a week
  • Thrice weekly: three times a week
  •  

    Get the latest updates

     Subscribe in a reader

    Prefer Email?
    Enter your email address:

    Delivered by FeedBurner