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What does the word fundamental mean?

Part of speech: adverb

Fundamentally.

Part of speech: adjective

Relating to or constituting a foundation; indispensable; basal.

Usage examples for fundamental

Mary's objection was fundamental. – Mary Minds Her Business by George Weston
It's a mere difference in fundamental theory which doesn't really matter a rap- except for after dinner purposes. – Gilbert Keith Chesterton by Maisie Ward