triennial

[ trahy-en-ee-uhl ]

adjective

1. occurring every three years.
2. lasting three years.

noun

1. a third anniversary.
2. something that appears or occurs every three years.
3. a period of three years; triennium.

triennial

/ traɪˈɛnɪəl /

adjective

1. relating to, lasting for, or occurring every three years

noun

1. a third anniversary
2. a triennial period, thing, or occurrence

Derived Forms

• triˈennially, adverb

Other Words From

• tri·enni·al·ly adverb

Word History and Origins

Origin of triennial¹

First recorded in 1555–65; trienni(um) + -al ¹

Word History and Origins

Origin of triennial¹

C17: from Latin triennium

Example Sentences

As African leaders gather in Beijing this week for the triennial China-Africa summit, Chinese President Xi Jinping may have one thing under his belt to boast about - satellite TV.

From BBC

Its first iteration, in 2019, was a hyperlocal concept: a triennial at storefront scale, bringing projects by St. Louis and national artists to parks, bakeries and taquerias on Cherokee Street, on the city’s south side.

From New York Times

Ironically, the United States is scheduled to present its triennial compliance report on Convention 182 this year.

From Washington Post

Smith, 83, also has a commission in Counterpublic, a new triennial in St. Louis, and is curating an exhibition featuring some 50 Native artists at the National Gallery of Art.

From New York Times

In October, Russia failed to win enough votes at ICAO's triennial assembly to keep its council seat.

From Reuters