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The scientific theory that a single occurence, no matter how small, can change the course of the universe forever.
1. A man travelled back in time to prehistoric ages and stepped on a butterfly, and the universe was entirely different when he got back.

2. The flap of a butterfly's wings changed the air around it so much that a tornado broke out two continents away.
by Jonah Rowley November 06, 2004
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1. A theory that everything affects everything-means that everything you do is kinda importsnt and has a reason ; Even the smallest things that you do can really affect your life-it also claims that if you could go back to past and change things that you might think are not important, things today would change (like so much) ; It is a part of The Chaos Theory “This effect grants the power to cause a hurricane in China to a butterfly flapping its wings in New Mexico. It may take a very long time, but the connection is real. If the butterfly had not flapped its wings at just the right point in space/time, the hurricane would not have happened. “

2.An Ashton Kutcher movie from 2004.

3. A song by Travis Scott from 2017.
1. « Wow, i wonder what would have happened if i kissed Maria at that school dance »
« Dude, what are you talking about, don’t mess with that butterfly effect thing »
via giphy
by therealnefertiti November 14, 2017
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The theory that even the smallest step one takes in his/her life can change the course of said life immensely. The name of this theory came to be when a Chaos Theory stated: "It has been said that something as small as the flutter of a butterfly's wing can ultimately cause a typhoon halfway around the world."
Right vs. Left
Up vs. Down
Noon vs. Midnight

These choices, once chosen, are all examples of the Butterfly Effect and how one of these choices vs. another will affect one's life greatly.
by ButterflyEffect April 25, 2009
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The scientific theory that a single occurrence, no matter how small, can change the course of the universe forever.
In the popular game, Life Is Strange, the main character discovers she has the ability to rewind time and leads to enact the Butterfly Effect
by imTHATgirl June 04, 2015
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Theory that everything matters. That even the flutter of a butterfly's wings can cause a hurricane on the otherside of the world. If you change even the smallest of life's details, you completely change its outcome.
You should go see the movie butterfly effect.
by Professor July 16, 2004
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an action that redefines the future
when elijah come back and redefines equality through the ecology and economy hence butterfly effect
by Imanuel July 12, 2009
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1. The theory that everything that happens must happen; that you can't save one thing without destroying something else. Coming from the idea of a butterfly caught in a spider's web. You can't save the butterfly without killing the spider (through violence or starvation).
(Also personified in the more popular saying, "Live and Let Die")
2. ... Also the name of a movie that portrays the previous definition. Er, I think. I haven't actually seen it. Is it any good? Excuse me if I don't hold my breath...
Stopping the bombing of Hiroshima would most likely have the butterfly effect that would have costed a multitude more lives.
(Please excuse the politically incorrect referance. My most heart-felt apologies go out to anyone particularly connected the the incident portrayed in this example.)
by Supermanchild January 02, 2004
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