in theory

idiom

Definition of in theory

1 used to say what should happen or be true if a theory is correctIn theory, the reading skills of the students should improve.
2 used to say that something seems to be true or possible as an idea but may not actually be true or possibleI agree with you in theory, but realistically I don't think we have the time to do that.

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“In theory.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/in%20theory. Accessed 14 December 2019.

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