théorie

/teɔʁi/
1.
nounfeminineSing

theory — a system of ideas or principles intended to explain facts or phenomena

in theory / in principle (as used in the expression «en théorie»)

En théorie, sa méthode devrait fonctionner, mais sur le terrain c'est plus compliqué.

In theory, his method should work, but in practice it's more complicated.

Synonyms:hypothèse, modèle, système, concept
théorie - French Definition & Examples