Usually means: Three-year period or cycle.
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We found 11 dictionaries that define the word triennium:

General (10 matching dictionaries)
  1. triennium: Merriam-Webster
  2. triennium: Oxford Learner's Dictionaries
  3. triennium: American Heritage Dictionary of the English Language
  4. triennium: Collins English Dictionary
  5. triennium: Wordnik
  6. triennium: Wiktionary
  7. triennium: Webster's New World College Dictionary, 4th Ed.
  8. triennium: Infoplease Dictionary
  9. triennium: Dictionary.com
  10. triennium: TheFreeDictionary.com

Science (1 matching dictionary)
  1. How Many? A Dictionary of Units of Measurement (No longer online)

(Note: See triennia as well.)

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Definitions from Wiktionary (triennium)

▸ noun:  A period of three years.

Similar:
tricennium, quadrennial, quadriennium, triduum, quadriennial, quinquennium, trimester, tetraeteris, ternion, trierarchy, more...

Opposite:
biennium, quadrennium, quinquennium

Adjectives:
first, next, last, second, previous, liberal, current, past, third, ante, bolshevik

▸ Words similar to triennium

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Similar:
tricennium, quadrennial, quadriennium, triduum, quadriennial, quinquennium, trimester, tetraeteris, ternion, trierarchy, more...

Opposite:
biennium, quadrennium, quinquennium

Adjectives:
first, next, last, second, previous, liberal, current, past, third, ante, bolshevik



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