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.
Test Your Vocabulary
Slippery Words Quiz—Changing with the Times
- What is an earlier meaning of nice?

Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
Slippery Words Quiz—Changing with the Times
Do you know these earlier meanings of words?
Take the quizWords of Snow and Ice Quiz
A selection of words from the chillier parts of t...
Take the quizTrue or False?
Test your knowledge - and maybe learn something a...
Take the quizWord Winder's CrossWinder Play the game
Share in theory