Something that happens four times a year is called quarterly. This means an event occurs every three months, or that a year is divided into four distinct parts (quarters), often referred to as Q1, Q2, Q3, and Q4 in business and finance.
Something that happens quarterly occurs four times per year, like your family's quarterly visit to your grandparents' house in Florida. Magazines that are published every three months come out quarterly — in fact, they're commonly referred to as quarterlies.
There is a movement afoot to simplify the calendar by making a year consistent with thirteen months, with each month exactly twenty-eight days long. The extra month would be called Sol (after our Sun) and would fall between June and July, thus giving those of us in the northern hemisphere an extra month of summer.
Quarter year
The calendar year can be divided into four quarters, often abbreviated as Q1, Q2, Q3, and Q4. Since they are three months each, they are also called trimesters.
A clock showing February 29, also known as leap day. They only happen about once every four years. Nearly every four years, the Gregorian calendar — which is used in the majority of countries around the world — gets an extra day: February 29.
When it comes to legal documents, such as obtaining a passport or driver's license, the date February 29th is recognized as the official birthday for leaplings in most countries. However, some states in the U.S. allow the leapling to celebrate their birthday on either February 28th or March 1st on non-leap years.
Leap years have long fascinated and puzzled people. Occurring every four years, they are more than just an extra day in February. They are a crucial adjustment to our calendar system, aligning it with the Earth's orbit around the Sun.
QUADRENNIAL Definition & Meaning - Merriam-Webster.
quarterly. A quarterly event happens four times a year, at intervals of three months.
American. [kwin-kwen-ee-uhl, kwing-] / kwɪnˈkwɛn i əl, kwɪŋ- /
Twelve months are named and ordered the same as those of the Gregorian calendar, except that the extra month is inserted between June and July, and called Sol.
In 45 B.C., Julius Caesar ordered a calendar consisting of twelve months based on a solar year. This calendar employed a cycle of three years of 365 days, followed by a year of 366 days (leap year). When first implemented, the "Julian Calendar" also moved the beginning of the year from March 1 to January 1.
Since there is an 11-day difference between the solar and lunar year, every 2-3 years a 13th month must be added to keep the seasons aligned. The Jews call this month Adar II. The Bible does not mention a 13th month.
A quarterly event happens four times a year, at intervals of three months.
Trimonthly means every three months.It can be used this way as an adjective, as in a trimonthly meeting, or an adverb, as in We plan to meet trimonthly.
Triannual is commonly used to mean one of two things: occurring once every three years or occurring three times per year. Triannual is a synonym of the less commonly used triennial, which can mean every three years or lasting for three years (though triannual is rarely if ever used in this second sense.)
This word might seem like a tongue-twister, but it carries a deep meaning. Derived from Greek roots, "agathos" meaning good and "kakos" meaning bad, it describes something composed of both good and evil.
Biannual refers to something that happens twice a year, typically once every six months. On the other hand, biennial is used to describe something that takes place every two years.
And the word is "Quarterly".
Usage notes
To avoid confusion between "triennial," once every three years, and "triannual," three times in one year, it is often better to substitute a less ambiguous phrase such as "three times a year" or "every four months."
The Quadrennial Cycle (Four Years, or 48 Months): This is also known as the Olympic Cycle, because "quad" means four, and Olympic Games are every four years.
But approximately every four years, February has 29 days instead of 28. So, there are 366 days in the year. This is called a leap year.
Human history spans millions of years, yet we count only 2025. This is because our calendar is a human-made system, not a reflection of Earth's true age. The widely used Gregorian calendar, introduced in 1582, is based on the birth of Jesus, but many civilizations had different ways of measuring time.
We begin with a calendar of 365 days per year. Our calendar year is shorter than the tropical year by 0.2422 days. So to correct (approximately), we add 1 day every four years (leap year). Thus, three calendar years are 365 days long; the fourth calendar year is 366 days long.