historic, historical / already-happened, past / former, old, traditional

area, district, particular geographic region

important, significant

importance, consequence, significance

history / the study of history

"Historical kana usage", a prescriptive method of using kana to write Japanese. Devised in the Edo period by Keichū (契沖) and taught in schools until 1946, it aims to be etymologically faithful and reflects earlier stages of the language (Heian period and earlier).

a target, a mark, a bullseye / an objective, an object (of doing something)

as far as ... is concerned; in terms of ...

Bacillus subtilis subsp. natto, the bacteria used to make natto.

importance