How to Say "greatest" in Spanish
The Spanish word for “greatest” is “máximo” — A2 level. This is a very common word in everyday Spanish.

Examples
Necesitamos alcanzar la velocidad máxima para llegar a tiempo.
We need to reach maximum speed to arrive on time.
El director tiene la máxima autoridad en la empresa.
The director has the greatest authority in the company.
El precio máximo por esta entrada es cincuenta euros.
The maximum price for this ticket is fifty euros.
Adjective Agreement
Remember that 'máximo' must match the noun it describes. Use 'máximo' for masculine nouns (el esfuerzo máximo) and 'máxima' for feminine nouns (la máxima calidad).
Confusing Máximo/a
Mistake: “La máximo velocidad.”
Correction: La máxima velocidad. (Since 'velocidad' is feminine, the adjective must also be feminine.)
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