第だい一いっ課かMeaningsNoun1. lesson one; first lesson2. first section (in an organization); first division; first departmentKanji used第ordinal number一one課subsectionComposed of第だい一いちfirst; foremost; number one; most important; best; greatest; most; above all; besides; in any case; …No-adjective課かlesson; section (in an organization); division; department; counter for lessons and chapters (of a book)Noun