Serial \Se"ri*al\, a. 1. Of or pertaining to a series; consisting of a series; appearing in successive parts or numbers; as, a serial work or publication. ``Classification . . . may be more or less serial.'' --H. Spencer. 2. (Bot.) Of or pertaining to rows. --Gray. {Serial homology}. (Biol.) See under {Homology}. {Serial symmetry}. (Biol.) See under {Symmetry}.