| 1. | Physics. a self-sustaining reaction in which the fission of nuclei of one generation of nuclei produces particles that cause the fission of at least an equal number of nuclei of the succeeding generation. |
| 2. | Chemistry. a reaction that results in a product necessary for the continuance of the reaction. |
| 3. | a series of events in which each event is the result of the one preceding and the cause of the one following. |
| chain reaction n.
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In chemistry and physics, a self-sustaining series of reactions. In a chain reaction in a uranium-based nuclear reactor, for example, a single neutron causes the nucleus of a uranium atom to undergo fission. In the process, two or three more neutrons are released. These neutrons start more fissions, which produce more neutrons, and so on.
Note: Figuratively speaking, any group of events linked so that one is the cause of the next can be called a “chain reaction.”
chain reaction n.
A series of events in which each induces or influences the next.
A series of chemical reactions in which one product of a reacting set is a reactant in the following set.
A multistage nuclear reaction, especially a self-sustaining series of fissions in which the release of neutrons from the splitting of one atom leads to the splitting of others.
chain reaction
A series of events in which each influences or gives rise to the next event, as in If one person collects substantial damages by suing a company, you can expect a chain reaction of such lawsuits. The term originated in the physical sciences, first (1920s) chemistry and later (1940) physics; in the latter it denotes a process of nuclear fission. By the 1940s it had been transferred to more general use.