say it: uhn-dur-LAHY-ing
underlying is an adjective meaning "in the nature of something though not readily apparent". It carries 3 recorded senses.
in the nature of something though not readily apparent
“shortcomings inherent in our approach”
“an underlying meaning”
located beneath or below
being or involving basic facts or principles
“the fundamental laws of the universe”
“a fundamental incompatibility between them”
“these rudimentary truths”
“underlying principles”
Definitions, synonyms and semantic relations for underlying 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.