1) biannual / semi-annual :
twice a year (once every 6 months)
For example :
i) She made her usual biannual visit to the dentist.
For example :
i) She made her usual biannual visit to the dentist.
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ii) She was excited about her semi-annual trip to Paris.
2) biennial :
once every two years
For example :
i) She was assigned the task of planning the biennial dinner for her company.
ii) They all look forward to the biennial treasure hunt sponsored by that club.
3) biweekly :
once every two weeks or twice a week (semiweekly)
*bi here means two or twice
For example :
i) She decided to subscribe to that Entertainment Magazine so she can receive a copy of the magazine on a biweekly basis.
ii) I try to make biweekly visits to the library.
4) fortnight :
14 days (2 weeks)
For example :
i) In about a fortnight, we will be experiencing a cold winter.
ii) She has lunch with her parents, once every fortnight.
iii) During the coming fortnight, I will be busy preparing for Christmas.
5) annum / per annum :
per year / yearly / annually
For example :
i) The magazine subscription fee is RM100 per annum.
Annual :
For example :
ii) She looks forward to her company's annual Christmas party.
(annual = once a year)
ii) They will look at your annual performance before they let you join that prestigious club.
(annual = for the whole year)
* prestigious = well-known / high reputation / respected
*An annual subscription : lasting for one year.
6) century / centennial : 100 years
For example :
i) People have believed in fairies for over a century.
ii) She was responsible for organizing a grand dinner to celebrate the company's centennial celebration.
7) decade : 10 years
For example :
i) This movie is about a genie that will choose a human once every decade and grant him or her three wishes.
ii) They have been married for over a decade.
8) millennium : 1000 years
For example :
i) He was proud to be a member of the committee that was in-charge of planning special events to celebrate the start of the new millennium.
ii) I cannot imagine the state of this planet in the next millennium.