How to Say "nine o'clock" in Spanish
The Spanish word for “nine o'clock” is “nueve” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
NounA1
referring to the hour (usually used as 'las nueve')

Examples
Mi número favorito es el nueve.
My favorite number is nine.
La película empieza a las nueve en punto.
The movie starts at nine o'clock sharp.
Sacó un nueve en el examen de matemáticas.
She got a nine (an A or high grade) on the math exam.
Talking about the hour
To say 'It is nine o'clock', you must use the feminine plural article 'las' because you are implicitly referring to 'las horas' (the hours): 'Son las nueve'.
Using the singular for time
Mistake: “Es el nueve. (When meaning 9:00 AM/PM)”
Correction: Son las nueve. (Correct for time, because it is plural hours, except for 1:00 PM/AM).
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