当とう代だい第だい一いちMeaningsNounNo-adjective1. the greatest of the dayKanji used当hit (the target)代substitute第ordinal number一oneComposed of当とう代だいthe present age; these days; (present) head of the familyNoun第だい一いちfirst; foremost; number one; most important; best; greatest; most; above all; besides; in any case; …No-adjective