1

fission

play
noun fis·sion \ˈfi-shən, -zhən\

Definition of fission

  1. 1 :  a splitting or breaking up into parts

  2. 2 :  reproduction by spontaneous division of the body into two or more parts each of which grows into a complete organism

  3. 3 :  the splitting of an atomic nucleus resulting in the release of large amounts of energy

fissional

play \-shə-nəl, -zhə-\ adjective

Origin and Etymology of fission

Latin fission-, fissio, from findere to split — more at bite


First Known Use: circa 1617


2

fission

verb fis·sion

Definition of fission

  1. intransitive verb
  2. :  to undergo fission

  3. transitive verb
  4. :  to cause to undergo fission

1929

First Known Use of fission

1929



FISSION Defined for English Language Learners

1

fission

play
noun fis·sion \ˈfi-shən, -zhən\

Definition of fission for English Language Learners

  • physics : a process in which the nucleus of a heavy atom is split apart

  • biology : a kind of reproduction in which a cell or body divides into two or more parts and each part grows into a whole new individual


FISSION Defined for Kids

fission

play
noun fis·sion \ˈfi-shən\

Definition of fission for Students

  1. 1 :  a method of reproduction in which a living cell or body divides into two or more parts each of which grows into a whole new individual

  2. 2 :  the process of splitting an atomic nucleus with the release of large amounts of energy


Medical Dictionary

fission

play play
noun fis·sion \ˈfish-ən also ˈfizh-\

Medical Definition of fission

  1. 1:  a method of reproduction in which a living cell or body divides into two or more parts each of which grows into a whole new individual

  2. 2a:  cleavage 2b:  the splitting of an atomic nucleus resulting in the release of large amounts of energy—called also nuclear fission

fission

verb

fissioned

;

fissioning

\ˈfish-(ə-)niŋ also ˈfizh-\play play

fissional

\ˈfish-ən-əl also ˈfizh-\play play adjective


Seen and Heard

What made you want to look up fission? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to search out and expose misconduct

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • alphabet-magnets
  • Which is the correct spelling?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ