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What is another word for fundament?

What's another word for fundament? | Here's a list of synonyms for fundament.

Definition 1: lowest support of a structure - [noun denoting artifact]

Definition 1: the fleshy part of the human body that you sit on - [noun denoting body]

Definition 1: the fundamental assumptions from which something is begun or developed or calculated or explained - [noun denoting cognition]