How to Say "foundation" in Spanish
The most common Spanish word for “foundation” is “base” — use 'base' when referring to the physical bottom part of an object or structure that supports it, or when discussing the fundamental principle of an argument or relationship..
base
/BAH-seh//ˈba.se/

Examples
La base de la lámpara es muy pesada para que no se caiga.
The base of the lamp is very heavy so it doesn't fall over.
Construyeron la casa sobre una base de concreto.
They built the house on a concrete foundation.
La confianza es la base de cualquier amistad.
Trust is the basis of any friendship.
Este postre tiene una base de chocolate y almendras.
This dessert has a base of chocolate and almonds.
Always Feminine: 'la base'
Even though 'base' doesn't end in '-a', it's a feminine word. Always remember to use 'la' or 'una' with it, like 'la base' (the base) or 'una base sólida' (a solid base).
fundación
Examples
La fundación ayuda a niños con problemas de visión.
The foundation helps children with vision problems.
firme
FEER-meh/ˈfiɾme/

Examples
Las obras de reparación del firme de la autopista durarán dos semanas.
The repair works on the highway pavement will last two weeks.
Gender Note
As a noun meaning 'road surface', 'firme' is always masculine: 'el firme'.
Base vs. Fundación
Related Translations
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