reduction division

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biology, genetics, cytology the first of the two divisions of meiosis, a type of cell division.
• noun biology, genetics, cytology meiosis as a whole, a type of cell division.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (genetics) cell division that produces reproductive cells in sexually reproducing organisms; the nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants)