Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A period of three years.

from The Century Dictionary.

  • noun A period of three years.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A period of three years.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Latin : tri-, tri- + annus, year; see at- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin triennium.

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