Constructed as a non-detachable part of a larger structure.
Being an essential and permanent part of something.
Being an included feature that normally comes as an extra.
Anything (such as a piece of furniture, or a software feature) that is built in, not added as an extra.
Contained in the essential nature of something but not openly shown
Implied indirectly, without being directly expressed
Having no reservations or doubts; unquestioning or unconditional; usually said of faith or trust.