• WordNet 3.6
    • n fission a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
    • n fission reproduction of some unicellular organisms by division of the cell into two more or less equal parts
    • ***
Webster's Revised Unabridged Dictionary
    • Fission A cleaving, splitting, or breaking up into parts.
    • Fission (Biol) A method of asexual reproduction among the lowest (unicellular) organisms by means of a process of self-division, consisting of gradual division or cleavage of the into two parts, each of which then becomes a separate and independent organisms; as when a cell in an animal or plant, or its germ, undergoes a spontaneous division, and the parts again subdivide. See Segmentation, and Cell division, under Division.
    • Fission (Zoöl) A process by which certain coral polyps, echinoderms, annelids, etc., spontaneously subdivide, each individual thus forming two or more new ones. See Strobilation.
    • Fission (Physics) The act or process of disintegration of an atomic nucleus into two or more smaller pieces; called also nuclear fission. The process may be spontaneous or induced by capture of neutrons or other smaller nuclei, and usually proceeds with evolution of energy.
    • ***
Century Dictionary and Cyclopedia
    • n fission The act of cleaving, splitting, or breaking up into parts.
    • n fission In biology, the automatic division of a cell or an independent organism into new cells or organisms; especially, such division as a process of multiplication or reproduction. Also fissuration. See cut under Paramecium.
    • ***
Chambers's Twentieth Century Dictionary
    • Fission a cleaving or breaking up into two parts
    • ***


Webster's Revised Unabridged Dictionary
L. fissio,. See Fissure
Chambers's Twentieth Century Dictionary
L. fissilis, from findĕre, fissum, to cleave.


In literature:

Under such pressure a different set of fissionables was formed.
"Tulan" by Carroll Mather Capps
But it was not fission.
"The Crystal Crypt" by Philip Kindred Dick
It is of the essence of the fission process that the resulting masses should be comparable in size.
"Pleasures of the telescope" by Garrett Serviss
FISSION and gemmation, ii.
"The Variation of Animals and Plants Under Domestication, Volume II (of 2)" by Charles Darwin
By the repetition of this process of fission, aggregations of various sizes and kinds are formed.
"Essays: Scientific, Political, & Speculative, Vol. I" by Herbert Spencer
In the simplest unicellular organisms which are known fission constitutes the only means of reproduction.
"The Sexual Question" by August Forel
What makes the whole thing terrible is that the freighter is loaded with fissionable material exported from Ganymede.
"Jack of No Trades" by Charles Cottrell
That means this stuff is not a fission product.
"The Blue Ghost Mystery" by Harold Leland Goodwin
In fact, if I didn't do something, after Saturday there would probably be no Don Morrison Fissionables Inc.
"Robots of the World! Arise!" by Mari Wolf
Surely you don't intend to carry fission or fusion weapons against them?
"The Planet Savers" by Marion Zimmer Bradley

In news:

Centromere Silencing and Function in Fission Yeast Is Governed by the Amino Terminus of Histone H3.
Cis-Acting DNA from Fission Yeast Centromeres Mediates Histone H3 Methylation and Recruitment of Sil.
Centromere Silencing and Function in Fission Yeast Is Governed by the Amino Terminus of Histone H3.
To continue the details of the origin of the term " fission ," here is more of the William "Bill" Arnold story.
Fission 2 is a powerful but easy-to-use audio editor.
Daughters of Fission are scheduled to perform Sunday, August 5, at Martini Ranch in Scottsdale.
The Daughters of Fission are a band in search of an identity.
Next step in advancing space travel: Fission rockets.
An artist's impression of the Project Bifrost fission rocket leaving Earth orbit for an interstellar mission.
Laser Microsurgery in Fission Yeast.
Medical education company Fission Communications has created a new oncology division for clients developing new therapies to cure cancer, the company announced this week.
Iodine radioisotopes are produced by fission of uranium fuel in a nuclear reactor.
Iodine radioisotopes are produced by fission of uranium fuel in a nuclear reactor.
Most naturally occurring uranium is U238, but this common isotope does not undergo fission – which is the process whereby the nucleus splits and releases tremendous amounts of energy.
Early nuclear scientists knew how to get the most energy out of uranium: by recycling its fissionable waste products into new fuel.

In science:

Abstract: Theoretical methods, interpretations and conclusions on the fission dynamics in a recent publication of H. Hofmann and F. A. Ivanyuk on the mean first passage time are critically considered.
Comment on Mean First Passage Time for Nuclear Fission and the Emission of Light Particles
Herndon has described the substructure of the Earth‟s inner core (radius 1250 km) as having at its center the georeactor, an actinide sub-core (radius 4 km) surrounded by a fluid or slurry subshell (radius 6 km) composed of fission products and products of radioactive decay , shown for example in Figure 4.
Nature of Planetary Matter and Magnetic Field Generation in the Solar System
Cumulative yield fraction of 238U and 235U fast neutron fission product elements plotted vs. ambient pressure melting point of each respective element.
Nature of Planetary Matter and Magnetic Field Generation in the Solar System
Ce was discovered by Markowitz et al. in 1954 at Brookhaven National Laboratory: A New 3.0min Ce Fission Product and its 5.95-hr Pr Daughter.
Discovery of the Cerium Isotopes
Caretto and Katcoff did not consider their measurement a new discovery: “146Ce and 146Pr were briefly reinvestigated.” They quote an unpublished report of the Fission Studies by Schuman reporting a half-life of 14.6(8) min which is also included in the adapted weighted average.
Discovery of the Cerium Isotopes