say it: fuhn-duh-MEN-tuhlz
fundamentals is a noun meaning "principles from which other truths can be derived". It carries one recorded sense.
principles from which other truths can be derived
“first you must learn the fundamentals”
“let's get down to basics”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for fundamentals come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.