I presume you were thinking of 'vigintennial', and I very much hope that your teacher didn't tell you that this was useful word. In fact, it is so rare that it doesn't even appear in most dictionaries. This word is never used - forget about it.
May 7, 2016
0
3
20th - I'm from USA, I've NEVER heard anyone use the other term
May 7, 2016
1
2
"Vigintennial" has a French/Latin origin, and is part of (very) formal English. Almost no-one uses this word, so we use "twentieth anniversary" 99.99% of the time.
May 7, 2016
0
1
I think (20th anniversary) is more famous
good luck
May 7, 2016
0
1
I can't imagine why anyone would tell you to use or even learn the word 'vigintenniel.'
May 7, 2016
0
0
Show more
Still haven’t found your answers?
Write down your questions and let the native speakers help you!