Being an essential and permanent part of something.
Being an included feature that normally comes as an extra.
Constructed as a non-detachable part of a larger structure.
Anything (such as a piece of furniture, or a software feature) that is built in, not added as an extra.
Of, pertaining to, or supplying a foundation; foundational; fundamental.
The creation of a foundation or base.
The first process in decorating by means of enamelled colour.