1The number five (5); indicating five units or the fifth in a series. Readings include the Sino-Japanese ご, the native-Japanese いつ (in compounds like 五日 いつか, 五つ いつつ), and an older い found in proper names such as 五十路 いそじ ('one's fifties') and 五十嵐 いがらし, as well as in the traditional counting 'hi-fu-mi-yo-itsu …'. The variant 伍 is used in legal documents to prevent forgery.
五人で会議に出席しました。
Five of us attended the meeting.
五月五日は子供の日です。
May 5th is Children's Day in Japan.
来週の五日に皆で集まろう。
Let's all get together on the fifth of next week.
ケーキを五つ買って帰った。
I bought five cakes and brought them home.
彼はもう五十路に入った。
He has already entered his fifties.
領収書には「金伍万円」と書かれていた。
The receipt was written 金伍万円 (fifty thousand yen) using the legal form of 'five'.