triennial   (TTS Sound)

The triennial has 2 Senses.

• tercentenary, triennial, tercentennial
• the 300th anniversary (or the celebration of it)
• 300周年（または、それの祝賀）

• triennial
• occurring every third year or lasting 3 years
• 3年ごとに起こるか、または3年続くさま