twenty-first day of the month

polyandry (plurality of husbands at the same time)

first discoverer (used especially in reference to the discovery of a dead body)

the Tokyo metropolitan region; the area surrounding and including the capital of Japan in Eastern Tokyo

(idiomatic) A traditional Japanese meal, consisting of a bowl of soup and three side dishes (rice, pickles, etc.).

(zoology) polyandry

the best or top person, such as the best performer in a company, or a leading expert

(linguistics) a historical consonantal shift of the Japanese language involving the kana は/ハ (ha), ひ/ヒ (hi), ふ/フ (fu), へ/ヘ (he), and ほ/ホ (ho)

three days ago

if you do not study when you are young, you will grow old quickly without accomplishing much learning