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"Ah" is a form of "ah", an interjection which is often translated as "ah". "Muy bien" is an interjection which is often translated as "very good". Learn more about the difference between "ah" and "muy bien" below.
ah(
ah
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. ah
¡Ah, qué lástima que no vengas!Ah, what a pity you're not coming!
b. oh
¡Ah! ¡Qué increíble sorpresa!Oh! What an incredible surprise!
c. aw
¡Ah! Creo que perdí mi reloj.Aw! I think I lost my watch.
2. (used to express interrogation)
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
(Latin America)
a. what
¿Ah? No entendí.What? I didn't get it.
b. eh
¿Ah? ¿Qué dijiste?Eh? What did you say?
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muy bien(
mwee
 
byehn
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. very good
¡Muy bien! Lo hiciste genial!Very good! You did great!
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. very well
Trabajamos muy bien juntos.We work very well together.
a. alright then
Ya empieza a oscurecer, así que me voy a casa. - Muy bien. Nos vemos mañana.It's getting dark already, so I'm off home. - Alright then. I'll see you tomorrow.
b. very well
A word or phrase that is seldom used in contemporary language and is recognized as being from another decade, (e.g., cat, groovy).
(old-fashioned)
No nos queda tiempo hoy. - Muy bien; lo dejamos para mañana.We don't have enough time left today. - Very well; we'll leave it for tomorrow.
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