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

Examples
Me encanta la amplitud de este salón; entra mucha luz.
I love the spaciousness of this living room; a lot of light comes in.
Debemos medir la amplitud de la entrada para ver si cabe el sofá.
We must measure the width of the entrance to see if the sofa fits.
La amplitud del valle era impresionante desde la cima.
The vastness of the valley was impressive from the summit.
Nouns ending in -tud
Words that end in '-tud' in Spanish, like 'amplitud', 'libertad', or 'gratitud', are almost always feminine. You should always use 'la' or 'una' with them.
Using 'amplitud' for space
While 'ancho' describes how wide something is, 'amplitud' describes the feeling of having a lot of room or space.
Gender confusion
Mistake: “El amplitud de la casa.”
Correction: La amplitud de la casa. (Because nouns ending in -tud are feminine).
Related Translations
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