internal disunity; internal division; internal rift
nuclear fission; karyokinesis (division of a cell nucleus during mitosis or meiosis)
fundamental schism (between the early Sthaviravāda and Mahāsāṃghika Buddhist schools)
direct division (i.e. amitosis)
somatic cell division (i.e. mitosis)
meristematic tissue; meristem
split election (where two or more candidates from the same party stand)