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theory noun [ ˈθɪəri ]

• a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
• "Darwin's theory of evolution"
Similar: hypothesis, thesis, conjecture, supposition, speculation, postulation, postulate, proposition, premise, surmise, assumption, presumption, presupposition, notion, guess, hunch, feeling, suspicion, opinion, view, belief, thinking, thought(s), judgement, contention, principles, ideas, concepts, principled explanations, laws, philosophy, ideology, system of ideas, science,
Origin: late 16th century (denoting a mental scheme of something to be done): via late Latin from Greek theōria ‘contemplation, speculation’, from theōros ‘spectator’.

in theory

• used in describing what is supposed to happen or be possible, usually with the implication that it does not in fact happen.
• "in theory, things can only get better; in practice, they may well become a lot worse"
Similar: in principle, on paper, in the abstract, all things being equal, in an ideal world, hypothetically, en principe,
Opposite: in practice, in reality,

in theory

• used in describing what is supposed to happen or be possible, usually with the implication that it does not in fact happen.
"in theory, things can only get better; in practice, they may well become a lot worse"



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