fundamento
foundation, basis
noun foon-dah-MEN-toh Rare
Origin: Latin fundamentum, from fundare 'to found'
Also means
grounds, rationale
Usage Note
Fundamento in the plural (fundamentos) often means 'fundamentals' or 'grounding' in a subject: los fundamentos del derecho. Sin fundamento means 'without basis' or 'unfounded'. Do not confuse with fundación ('foundation' as an organisation or the act of founding).
Examples
"Su argumento carece de fundamento."
Natural Translation
His argument lacks a basis.

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