theory
In Italian, the word 'teoria' is used to describe a set of principles or ideas that are intended to explain something. It is similar to the English word 'theory', and can be used in a variety of contexts, including scientific and philosophical discussions.
The Big Bang theory is widely accepted in the scientific community.
This sentence is expressing the general acceptance of the Big Bang theory within the scientific community. It's indicating that this theory is the main explanation for the creation of the universe among scientists.
I need to study the theory before my exam.
The speaker is stating they need to do some studying specifically focused on theory knowledge. The theory could be about any subject they need to be tested on. The statement implies a near future exam.
Our theory is that he is the culprit.
In this sentence, the speaker and those they are associated with are speculating that a certain individual is at fault or guilty of something. It implies suspicion and the act of deducing a conclusion based on available evidence.