1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Core Words Familarize yourself with the 'core words'.
Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Wordsense Learn about the wordsenses of the english term.

ETYMOLOGY

KOREAN 3.0 Eng Wordtype Etym. Gb Vie
☆☆ ONE AT A TIME; SEPARATELY Adverb 一一 이 个个 từng cái, từng thứ
☆☆ ONE AT A TIME; SEPARATELY Adverb 一个个 từng cái từng cái