一日(P);1日(P) [いちにち(P);いちじつ] /(n,adv) (1) one day/(adv,n) (2) (いちにち only) (See 一日中) all day (long)/the whole day/from morning till night/(n) (3) (See 1日・ついたち・1) 1st day of the month/(P)/EntL1576260/