How to Say "3rd" in Spanish
The Spanish word for “3rd” is “tercero” — A1 level. This is a very common word in everyday Spanish.

Examples
Este es el tercer libro que leo esta semana.
This is the third book I've read this week.
Ella vive en la tercera planta de este edificio.
She lives on the third floor of this building.
Mi hermana es la tercera de cuatro hijos.
My sister is the third of four children.
The Shortening Rule (Apocope)
When 'tercero' is used directly before a singular masculine noun (like 'día' or 'piso'), it shortens to 'tercer'. (e.g., el tercer día).
Gender Agreement
Like most Spanish adjectives, 'tercero' changes its ending to match the noun it describes: 'tercero' (masculine) and 'tercera' (feminine).
Forgetting to Shorten
Mistake: “El tercero piso.”
Correction: El tercer piso. Remember to drop the '-o' before masculine singular nouns.
Related Translations
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