tomoe (circular design)

a traditional Chinese S-shaped geometric pattern

Inner Mongolia (an autonomous region of China)

Outer Mongolia

Obsolete spelling of シカゴ (Shikago, “Chicago (a city in Illinois, United States)”)

the Paleogene period

Synonym of 黄昏 (tasogare, “dusk; twilight”) / Synonym of 黄昏時 (tasogaredoki, “dusk; twilight”)

"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).

revisionism

a 家紋 (kamon, “family crest”) design featuring a star shape similar to a Star of David