How to Say "randomness" in Spanish
The Spanish word for “randomness” is “azar” — B1 level. This is a very common word in everyday Spanish.

Examples
La lotería depende del puro azar.
The lottery depends on pure chance.
Encontré mi viejo libro por azar en la librería.
I found my old book by chance in the bookstore.
Elegimos el ganador al azar de entre todos los participantes.
We chose the winner at random from all the participants.
Always Masculine
Even though it ends in 'r', 'azar' is always a masculine noun, meaning you must use the article 'el' (el azar).
Confusing 'al azar' and 'por azar'
Mistake: “Using 'por azar' when describing the method of selection.”
Correction: Use 'al azar' (at random) to describe the *way* something is chosen (e.g., 'Lo elegí al azar'). Use 'por azar' (by chance) to describe *why* something happened (e.g., 'Nos encontramos por azar').
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