The scientific theory that a single occurence, no matter how small, can change the course of the universe forever.

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.

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."

an action that redefines the future

1. A theroy stating that if one was to step on a butterfly some 65 million years ago, it would change the entire course of history in the present.

2. As a butterfly flaps its wings in one part of the world, a disaster is happening in another part of the world.

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...

when a man repeatedly pounds a womans vagina until her vagina lips become so loose that she can flap them like the wings of a butterfly.