trienniums

• plural

  plural

  The grammatical form denoting more than one person, place, thing, or idea.

  of triennium.
  triennium

  noun

  a period of three years.

More Suggestions

• biennium
• triennial
• decennium
• tricennial
• triclinium
• triecious
• triens
• quadriennium
• unnilennium