Noun and Suffix
しゅうねん
トーフグは、来年で十周年になるので、コウイチは周年プロジェクトをけい画しています。
The next year is Tofugu's 10th anniversary, so Koichi is planning an anniversary project.
うちの実家は、にゅう牛の周年放ぼくをしています。今年は、放ぼく事業を始めてから、ちょうど二十周年です。
My family grazes dairy cow herds year round. This year is the 20th anniversary of their grazing business.
今度の日曜日に、私達はマクドナルドでTofuguの五周年記念を祝います。
Next Sunday we’ll celebrate Tofugu’s fifth anniversary at McDonald’s.
When you wrap around the entire circumference of the year you've come back around to the start of it. This is the anniversary.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.