Added 9 October 2026 built-in /ˈbɪltɪn/ adjective Categories: Describing WordsObscure Words adjective ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about built-in at Wordnik → Where our words come from → Constructed as a nondetachable part of a larger structure. Being an essential and permanent part of something. Being an included feature that normally comes as an extra. noun Anything (such as a piece of furniture, or a software feature) that is built in, not added as an extra. A function that is built into a system. Related Words: inbuiltintrinsicalintegralintrinsicconstitutionalinherentconsolidatedinnerinclusiveintegratedadd-onattached Back to today's word