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

Examples
Luchamos por la igualdad de género.
We fight for gender equality.
Todos los ciudadanos tienen igualdad ante la ley.
All citizens have equality before the law.
La igualdad de oportunidades es esencial en una democracia.
Equality of opportunity is essential in a democracy.
Always Feminine
In Spanish, almost every word that ends in '-dad' is feminine. You should always use 'la' or 'una' with this word.
Connecting with 'de'
To say 'equality of' something, just use the word 'de' followed by the topic, like 'igualdad de salario' (pay equality).
The 'el' Trap
Mistake: “el igualdad”
Correction: la igualdad (because words ending in -dad are feminine)
Igualdad vs. Equidad
Mistake: “Using 'igualdad' when you mean 'fairness' based on individual needs.”
Correction: Use 'igualdad' for everyone getting the same thing, but use 'equidad' for people getting what they specifically need to be successful.
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