pentathlon

fifteenth day of the month

five days in the week

to grumble (about something trivial)

a surname

the five lakes around Mount Fuji: 本(もと)栖(す)湖(こ) (Motosu-ko), 精(しょう)進(じ)湖(こ) (Shōji-ko), 西(さい)湖(こ) (Sai-ko), 河(かわ)口(ぐち)湖(こ) (Kawaguchi-ko) and 山(やま)中(なか)湖(こ) (Yamanaka-ko).

If one learns without thinking, one will be lost in his learning. That is, if one does not think about what one learns, he will not arrive at the truth of it.

(linear algebra) upper triangular matrix

(grammar) an abbreviation for 上二段活用; upper dual grade conjugation

(grammar) Short for 上一段活用 (kami ichidan katsuyō): upper monograde conjugation