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noun (theor, ies, -)
  1. (countable) An unproven conjecture.
I have a about who broke into the school last night, but I have no proof to back it up.
  1. (uncountable) An expectation of what should happen, barring unforeseen circumstances.
So we"ll be there in three hours? " That"s the .
  1. (countable) (science) A coherent statement or set of statements that attempts to explain observed phenomenon, phenomena.
There is now a well-developed of electrical charge.
  1. (countable) (science) A logical structure that enables one to deduce the possible results of every experiment that falls within its purview.
The of relativity was proposed by Einstein.
  1. (uncountable) (mathematics) A field of study attempting to exhaustively describe a particular class of constructs.
Knot classifies the mappings of a circle into 3-space.
  1. (countable) (logic) A set of axioms together with all statements derivable from them.
A is consistent if it has a model.
Etymology: English since 1613, from French théorie < Latin theoria < Greek (polytonic, ) ("contemplation, speculation, a looking at, things looked at") < (polytonic, ) (to look at, view, consider, examine) < (polytonic, ) (spectator) < (polytonic, ) (a view) + (polytonic, á) (to see, to look).


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