say it: BIL-tin
built-in is an adjective meaning "existing as an essential constituent or characteristic". It carries one recorded sense.
existing as an essential constituent or characteristic
“the Ptolemaic system with its built-in concept of periodicity”
“a constitutional inability to tell the truth”
Definitions, synonyms and semantic relations for built-in 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.