Should Built in Be Hyphenated?

The rules regarding hyphens in compound adjectives are these: If the compound adjective is right before the noun, use a hyphen: Built-in types. A well-educated student.

Is it built in or built in?

Built-in (adj): included as part of something and not separate from it. In-built (adj) is used less frequent: Meaning is the same as above. (So, both can be used to describe that Siri is an in-built/a built-in feature of an iPhone.

How do you spell built ins?

built so as to be an integral and permanent part of a larger construction: The wall has a built-in bookcase. existing as a natural or characteristic part of something; inherent: a built-in contempt for daydreaming.