butter fly effect

butterfly effect

noun
a cumulatively large effect that a very small natural force may produce over a period of time.

Origin:
1980–85; so called from the notion that the fluttering of a butterfly's wings may set off currents that will grow into a large storm

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World English Dictionary
butterfly effect
 
n
the idea, used in chaos theory, that a very small difference in the initial state of a physical system can make a significant difference to the state at some later time
 
[C20: from the theory that a butterfly flapping its wings in one part of the world might ultimately cause a hurricane in another part of the world]

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