To belong to or be a part of, whether by right, nature, appointment, or custom; to relate to.
To belong as a part, right, possession, attribute, etc.
To consider as part of something; to comprehend.
To use a directive that allows the use of source code from another file.
To bring into a group, class, set, or total as a (new) part or member.
A piece of source code or other content that is dynamically retrieved for inclusion in another item.