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An anniversary is

a date that is an exact number of years after the date of an important or special event

I'm wondering if there are some words indicating a date that is half a year, a fortnight or even a month after the date of an important or special event.

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Although not strictly an answer to your question, the term "half birthday" is common in the USA. It means six months after your birthday. Its usage is common in grade school, so that classes can celebrate the birthdays of children whose birthday falls during the summer vacation. –  Fraser Orr Dec 30 '11 at 1:56

3 Answers 3

Given:

semi-, prefix: half of or occurring halfway through (a specified period of time) [MW]

A semi-anniversary (or semianniversary) would be a six-month anniversary.

(Edit: The term di-anniversary shows up in searches; the only problem is, di- means "twice : twofold : double" not "half.")

Some Googling turns up mensiversary (from Latin mensis for month) as a term for a one-month anniversary.

If you tortured Latin sufficiently, you could probably formulate a term for a fortnight anniversary; but then the language police would get you.

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There had been some attempts in trying to promote the use of certain neologisms, but none of them apparently really caught on. The safest way of referring to such dates is by using the simpler term anniversary preceded by the period.

I wouldn't personally use any other alternative. Imagine that if they can't agree on a basic period like a month, what is left for fortnights or weeks or any other less common arbitrary period of time.

According to Merriam-Webster:

Definition of ANNIVERSARY
1 : the annual recurrence of a date marking a notable event;
broadly : a date that follows such an event by a specified period of time measured in units other than years

Hope it helps.

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I use "six-month anniversary" and similar terms. Strictly speaking, you're not supposed to do that because "anniversary" comes from the Latin "annus" which means "year", but communication is achieved nevertheless. Nobody has ever asked me to clarify the term "two-month anniversary" for example. –  Irene Dec 28 '11 at 8:12
    
'catched on' sounds new to me? –  Kris Dec 28 '11 at 11:32
    
wordreference.com/definition/catch catch on informal 1 (of a practice or fashion) become popular. –  Eduardo Dec 28 '11 at 16:31
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The past tense of ‘catch on’ is ‘caught on’. –  tchrist Dec 29 '11 at 0:16
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@tchrist You are right. However I think it's worth mentioning that catched used to be the simple past of to catch up to some time where its use started to decline in favor of caught. Nonetheless, the past tense of the phrasal to catch on was never catched on but caught on; so ... +1 and my apologies. Wiktionary: catched (obsolete or nonstandard) Simple past tense and past participle of catch. Synonyms: caught –  Eduardo Dec 29 '11 at 3:35

The word you are looking for is Di-anniversary (Dianniversary).

"They got together on christmas, so their dianniversary would be june 25th".

Refer this link http://www.urbandictionary.com/define.php?term=Dianniversary&defid=4049001

and half year is referred to as "Biannual".

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Urban Dictionary is not a reliable source for most things. –  Mahnax Dec 28 '11 at 8:02
    
but that is the only word available for half a year celebration as far as i know. its not just on Urban dictionary. –  Apoorva Dec 28 '11 at 9:10
    
Thanks for your answer, @Apoorva. Does this word mean two celebrations a year or exactly half a year celebration? I think this two meanings slightly differ. –  Au-Yeung Kham Sau Dec 29 '11 at 4:06
    
It means celebration of exactly half an anniversary. And u r right, two celebrations a year means totally different from this.. 2 Dianniversaries=1 Anniversary. –  Apoorva Dec 29 '11 at 5:59

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