1. in theory - Adverb
2. in theory - Phrase
with regard to fundamentals although not concerning details
Source: WordNetIn theory there is a possibility of perfect happiness: To believe in the indestructible element within one, and not to strive towards it. Franz Kafka
In theory there is no difference between theory and practice; in practice there is. Yogi Berra
In my travels, I also noticed that kids in Thailand like spicy food, and kids in India love curry. I'm hoping to introduce my son, Hudson, to lots of veggies and spices when he's young. I say that before he's started on solid foods, so it could be easier in theory than practice! Curtis Stone
It would be consistent and proper for us to join the war for democratic freedom, only if we would likewise be assured that democratic freedom in theory as well as in practice. Aung San
And capital punishment, however ineffective it may be and through whatever ignorance it may be resorted to, is a strictly defensive act, - at least in theory. Benjamin Tucker
I can only say with deeper sincerity and fuller significance what I have always said in theory - Wait God's will. Charlotte Brontë