Korean

Adverb

제일 • ‎(jeil) ‎(hanja 第一)

1. number one; the first or primary
2. (by extension) most; -est
3. (forms superlatives of adjectives)

   그 사전은 제일 좋아요.‎

   Geu sajeon-eun jeil joayo.

   This dictionary is the best.

See also

• 보다 (boda, “more”)
• 가장 (gajang, “most”)

Usage notes

The most common use of this is in front of an adjective or adjectival phrase, to denote superlativity.

A 2007 decision by the Patent Court of Korea found that while the superlative sense of 제일 is not distinctive, the use of 제일 in front of a noun is distinctive and can be protected by trademark.