Q: What is a term for something that happens every eighteen months?

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we have a semiannual banquet for our club that happens every 6 months

Once every 12 months, once every 6 months, once every 3 months

there are 12 months in every Gregorian year.

Every three months is called a quarter. And there are four quarters in a year.

The Olympics and leap years occur every four years ..Presidential elections as well.

Related questions

Quarter. At every Quarter of the financial year (every 3 months).

Moores law states that the number of discrete logical components on an area of silicone will double every eighteen months (his grammer is better). this means that every eighteen months the speed/capasity of a device should roughly double, giveing engineers twice as much process to play with and invent new stuff based on.

Bi-monthly means every two months. (Semi-monthly means twice a month). There may be cases where these terms are misused, so be careful.

According to the online Oxford Dictionaries, "bimonthly" can refer to something occurring every two months or twice in one month. It might be best to just say "every two months" to avoid confusion.

weekly

twice-a-day or it can be called semi-diurnal which relates to such occurrences as tides.

1/2 a year

Something that happens once a century.

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Quarterly

A triennial event happens every three years.

Something that happens every 5 years