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THEORY

an idea or a belief or an outlook that is based on an observation or an experience

 

 examples...

 the sun must be hot because everything always warms up when the sun is shining

 or

 the earth must be round because when the lower part of a ship disappears beyond the horizon the tallest part of the ship is still visible

 or

 evolution and devolution must be happening because all newly born beings aren't totally dependant on the their parents but human babies are

 or

 relativity theory must be right because when an atomic clock in an aeroplane is compared to the time of an atomic clock on the ground the clock in the aeroplane runs slower than the clock on the ground

 or

quantum theory must be right because it explains atomic behaviour and it can be used to make precision devices like computers and tv's