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.
Inborn.
Trapped within a rock at the time of its formation (especially of water or petroleum).
United with other organs of the same kind (for example sepals connate with sepals, petals connate with petals, or stamens with stamens).
Of the same or a similar nature; proceeding from the same stock or root.