Baekje noun1 •(historical) An ancient kingdom in modern Korea, one of the Three Kingdoms, existing from 18 BCE to 660 CE; at its maximum covering most of modern western South Korea.The site, yet to be named, straddles the farming counties of Yeongi and Gongju. The capital of the Baekje Kingdom in the fifth and sixth centuries was Gongju, which reportedly has good feng shui. — 2004