先せん頭とう集しゅう団だんMeaningsNoun1. leading group (of runners in a marathon, etc.); leading packKanji used先before (timewise)頭head集gather together団groupComposed of先せん頭とうhead (of a line, group, etc.); front; lead; forefront; vanguardNoun集しゅう団だんgroup; massNoun