principle
The Spanish word 'principio' translates to 'principle' in English. It can be used in various contexts. In one sense, it could represent a fundamental truth or proposition that serves as the foundation for a system of belief, behavior, or for a chain of reasoning, similar to its English counterpart. Additionally, it might also signify the beginning or starting point of something, such as in a phrase meaning 'at the beginning.'
In principle, we're going to learn Spanish.
This phrase implies that the initial plan or agreement is to learn Spanish, it sets the goal that the speaker and the listener are aiming for.
The beginning of the book is very interesting.
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This is the beginning of a beautiful friendship.
Expression is used to refer to the start or the initial stage of what the speaker believes will develop into a strong and beautiful friendship.