the GNU version of the Collaborative International Dictionary of English
n. Direct cell division (in which there is first a simple division of the nucleus, without any changes in its structure, followed by division of the protoplasm of the cell); -- in opposition to karyokinesis.
The Century Dictionary and Cyclopedia
n. Amitosis, akinesia, or direct cell-division, as distinguished from mitosis or karvokinesis: so called because the nucleus divides by simple constriction without forming a spindle. See amitosis, with cut.