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1. In common, everyday language when you have a theory it means you simply have a guess. It doesn't have to be supported by evidence or fact.

2. In the scientific community, an explanation supported by a evidence and is logically sound.
1. "My theory is that Jane stole the cookie from the cookie jar!" - Jack after he found no cookies in the cookie jar.

2. The theory of Evolution logically explains why life is so diverse, and the evidence that supports it includes fossils, DNA, living specimens, and bacterial research.
by Jack the Smack October 21, 2009
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2
A well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena.
"Theories can incorporate facts and laws and tested hypotheses."

"True in fact and theory."
by Jordan O'connors November 07, 2005
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3
When a girls personality and looks are so good you forget about your surroundings
YOU- DON'T REALIZE YOUR BOYS LEAVE
YOUR BOY- " AY FAM YOU'RE IN THEORY LOOOL"
via giphy
by Cozy and Mbreezy November 27, 2018
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4
A Theory is when people think up an idea and back up with fake facts. Such as The flat earthers or the dinosaur earthers or the center of the universe-ers Even Pizza earthers or Big Chungus earthers. OR Game Theory the youtube channel that uses games and fake facts then makes a fake theory on it and makes a fake video with a fake script by a fake person
"Im going to make a theory on this!"

Or
"Thats just a theory!"
by THE ULTIMATE DECISION maker February 14, 2019
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5
Theory is the most beautiful girl on the face of the earth. When people see her walk by they think, β€œDamn I wish I could be with her.” No matter what their sexuality is. Everyone needs a theory in their life. She is the life of the party and is loved by everyone.
β€œOh my, there goes theory. I wish she would be my girlfriend”
by Lil.peep.. March 03, 2019
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