triennial

/tɹˈa‍ɪnɪəl/

/tɹaɪˈɛniəɫ/

[noun] [adjective]

Triennial

[NOUN]

the 300th anniversary (or the celebration of it)

synonyms : tercentenary

tercentennial

triennial

[ADJECTIVE]

occurring every third year or lasting 3 years

Examples

1. The Protector with a council and triennial parliaments was continued, but the ancient constitution was largely restored including a so-called Other House, a kind of House of Lords of nominated members.

2. For example, a few years ago I was invited to a triennial in Brazil and I worked with a woman who was 87 at the time, named Mariko Sakata, of Japanese origin.