fission(redirected from fissions)
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Related to fissions: induced fission
fission of a uranium nucleus
1. The act or process of splitting into parts.
2. A nuclear reaction in which an atomic nucleus, especially a heavy nucleus, such as an isotope of uranium, splits into fragments, usually two fragments of comparable but unequal mass, and releases a few neutrons and about 100 million electron volts of energy. Nuclear fission may occur spontaneously or may be induced by the absorption of a neutron, which can initiate a nuclear chain reaction.
3. Biology An asexual reproductive process in which a unicellular organism divides into two or more independently maturing daughter cells.
v. fis·sioned, fis·sion·ing, fis·sions
To cause (an atom) to undergo fission.
To undergo fission.
[Latin fissiō, fissiōn-, a cleaving, from fissus, split; see fissi-.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. the act or process of splitting or breaking into parts
2. (Biology) biology a form of asexual reproduction in single-celled animals and plants involving a division into two or more equal parts that develop into new cells
3. (General Physics) short for nuclear fission
[C19: from Latin fissiō a cleaving]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. the act of cleaving or splitting into parts.
2. the splitting of the nucleus of an atom into nuclei of lighter atoms, accompanied by the release of energy.
3. the division of a biological organism into new organisms as a process of reproduction.v.t.
4. to cause (an atom) to undergo fission.Compare fusion (def. 4).
[1835–45; < Latin fissiō splitting, cleaving]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
1. The splitting of the nucleus of an atom into two or more nuclei. The splitting occurs either spontaneously, because the nucleus has many neutrons and is unstable, or because the nucleus has collided with a free-moving neutron. The splitting of a nucleus releases one or more neutrons and energy in the form of radiation. See Note at fusion.
2. A reproductive process in which a single cell splits to form two independent cells that later grow to full size. Bacteria and other single-celled organisms usually reproduce by means of fission. Also called binary fission.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The process whereby the nucleus of a heavy element splits into (generally) two nuclei of lighter elements, with the release of substantial amounts of energy.
Dictionary of Military and Associated Terms. US Department of Defense 2005.
1. A process (spontaneous or induced) during which a heavy atomic nucleus disintegrates into two lighter atoms which together have less mass than the total initial material. This lost mass is converted to energy, the amount is given by Einstein’s equation E=mc2.
2. The splitting of an atom’s nucleus to release subatomic particles and energy.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
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|Noun||1.||fission - reproduction of some unicellular organisms by division of the cell into two more or less equal parts|
schizogony - asexual reproduction by multiple fission; characteristic of many sporozoan protozoans
|2.||fission - a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy|
nuclear reaction - (physics) a process that alters the energy or structure or composition of atomic nuclei
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
noun splitting, parting, breaking, division, rending, rupture, cleavage, schism, scission a fission in the earth's crust
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002
fission[ˈfɪʃən] N (Phys) → fisión f (Bio) → escisión f
atomic/nuclear fission → fisión f atómica/nuclear
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
Collins English/French Electronic Resource. © HarperCollins Publishers 2005
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
fissionnoun : nuclear fission (ˈfiʃən)
the splitting of the nuclei of atoms. splitsing إنْشِطار деление fissão štěpení die Spaltung fission; spaltning σχάση fisión aatomituuma lõhustamine کافش fissio fission בִקוַּע גַרעִינִי अणुओं का विभाजन, जीव कोशों का विभाजन fisija, cijepanje (raspadanje) atoma (mag)hasadás fisi kjarnaklofningur fissione 核分裂 핵분열 skilimas atomkodola šķelšanās pembelahan splijtingspalting, fisjon rozszczepienie سورى كېدنه، ما تېدنه، ټوټى كېدنه، دړى وړى كېدنه fissão fisiune атомный распад štiepenie jadra cepitev fisija klyvning, kärnklyvning การแตกตัวของนิวเคลียสของอะตอม (ทางฟิสิกส์) nükleer bölünme 分裂（核分裂） розщеплення (атомного ядра) ٹوٹنے یا بکھرنے سے طاقت کا اخراج ہونا sự phân hạch 裂变
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.
1. división en partes;
2. división de un átomo para ser descompuesto y desplazar energía y neutrones.
English-Spanish Medical Dictionary © Farlex 2012