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Well, good, or correctly
Lo hice bien.
I did it well.
¿Cómo estás?
How are you?
Can be used as an adverb or interjection.
Yes, okay, or alright (informal)
¿Vamos al cine? — ¡Bien!
Shall we go to the cinema? — Sure!
'Bien' is often used to express agreement or approval, similar to 'okay' or 'sure' in English.
As an adverb, 'bien' modifies verbs, adjectives, or other adverbs. As an interjection, it expresses agreement or enthusiasm.
From Latin 'bene', meaning 'well'.
In Spanish, 'bien' can function as an adverb, interjection, or even an adjective in some contexts. It is a very versatile word.