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Definition of fundamental
forming a necessary base or core; of central importance:the protection of fundamental human rights interpretation of evidence is fundamental to the historian’s craft affecting or relating to the essential nature of something or the crucial point about an issue:the fundamental problem remains that of the housing shortage so basic as to be hard to alter, resolve, or overcome:the theories are based on a fundamental error
) a central or primary rule or principle on which something is based:two courses cover the fundamentals of microbiology
2 Music a fundamental note, tone, or frequency.