Constructed as an integral part of something; built-in to a structure or system rather than added separately.
From 'built-in,' hyphenated (from 'build' + 'in'). Modern usage often drops the hyphen, especially in computing contexts, where 'builtin' refers to native functions or features.
In programming, 'builtin' functions are like kitchen appliances that come with the house—they're there by default, so you don't have to install them yourself. This metaphor reveals how tech language borrows from physical construction.
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