Rome wasn't built in a day

(idiomatic, proverb) be quick on the uptake, understand the whole situation from just a few clues

Kyūjitai form of 三位一体 (“Trinity”)

(obsolete) being surprised twice / (obsolete) more specifically, describes the appearance of a woman who has a beautiful figure from behind but has an ugly face

(Christianity) the Trinity

Clipping of 一千一夜物語 (Issen'ichiya Monogatari, “One Thousand and One Nights”).

thirty-first day of the month

twenty-first day of the month

short for 小倉百人一首 (Ogura Hyakunin Isshu): a famous "one hundred poems anthology", used as the basis of certain card games

an anthology of one hundred poems by one hundred poets, one poet for each poem