Meaning of “foundation” - Learner’s Dictionary

foundation

noun uk us /faʊnˈdeɪʃən/
IDEA [ C ]

the idea or principle that something is based on:

Jefferson's document formed the foundation of a new nation.
STARTING [ U ]

the process of establishing an organization, state, or country:

the foundation of a new state
ORGANIZATION [ C ]

an organization that gives money for a particular purpose:

the Mental Health Foundation
foundations [ plural ] mainly UK (US foundation [ C ])

the part of a building, road, bridge, etc that is under the ground and supports it:

concrete foundations
MAKE-UP [ U ]

make-up that is worn all over the face to give it a smooth appearance

be without foundation; have no foundation

If something is without foundation, there is no proof that it is true:

The allegations are completely without foundation.

(Definition of “foundation” from the Cambridge Learner’s Dictionary © Cambridge University Press)