一

Physics

grand unified theory

(with) a flash of a drawn sword; brandishing a sword

Collections of the Twenty-One Eras; twenty-one collections of waka compiled by imperial command (early Heian to early Muromachi)

extremely important or once in a lifetime (request); only once in one's lifetime

coincident indicator

Proverb

take care of the penny; he who makes fun of one yen will cry at one yen

Proverb

Rome was not built in a day

Linguistics

first person

first philosophy

Often 同一平面上に

coplanar; in the same plane; flush; even (with)

being inseparable as a form and its shadow; a person's deed mirrors the good or evil of his mind; husband and wife being never apart

one country, two systems (Chinese policy allowing for areas such as Hong Kong to maintain their own economic and administrative systems)

single market (e.g. European single market)

being the sole master of the situation; reigning supreme; standing unchallenged

concentration of mind; mental concentration (on some task)

staunch (steadfast, single-hearted) in one's devotion to his master (lord)

Suru verb - special class

to laugh (something) off; to dismiss with a laugh; to pooh-pooh

one and only; unique

temporary protective custody facility; temporary care center

a complete turnabout via a single blow

without intermission for many years; with constancy of purpose for many years; in the same old rut for years on end

digital single-lens reflex camera; DSLR camera

Shinto

two bows, two claps, and a third bow (common form of worshipping at a shrine)

great one-horned rhinoceros (Rhinoceros unicornis); Indian rhinoceros