inclusion

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The act of including or the state of being included.
2. n. Something included.
3. n. Geology A solid, liquid, or gaseous foreign body enclosed in a mineral or rock.
4. n. Biology A nonliving mass, such as a droplet of fat, in the cytoplasm of a cell.
5. n. Computer Science A logical operation that assumes the second statement of a pair is true if the first one is true.

Century Dictionary and Cyclopedia

1. n. The act of including, or the state of being included.
2. n. That which is included or inclosed. Used in mineralogy of a body, usually minute, such as a liquid or a small crystal, which is inclosed within the mass of another. Thus, topaz often contains inclusions consisting of liquid carbon dioxid. The inclusions in a crystal have often a definite orientation with reference to the crystallo-graphic axes, as for example in the mineral leucite. According to the nature of the inclosed substance, the inclusions are spoken of as gas inclusions, glass inclusions, fluid inclusions, etc., and the cavities themselves are called gas-cavities or gas-pores, glass-cavities, etc.
3. n. The contents of vesicles, of all sizes, in protoplasm as an emulsion, enveloped by pellicles of the continuous substance or plasma; the discontinuous portions of protoplasm.

Wiktionary

1. n. countable An addition or annex to a group, set, or total.
2. n. uncountable The act of including, i.e. adding or annexing, (something) to a group, set, or total.
3. n. countable Anything foreign that is included in a material,
4. n. countable, mineralogy Any material that is trapped inside a mineral during its formation, as a defect in a precious stone.

GNU Webster's 1913

1. n. The act of including, or the state of being included; limitation; restriction.
2. n. Something that is included.
3. n. (Min.) A foreign substance, either liquid or solid, usually of minute size, inclosed in the mass of a mineral.
4. n. (Biol., Cytology) A small body suspended within the cytoplasm of a cell.
5. n. (Logic, Math.) The relationship existing between two sets if one is a subset of the other.

WordNet 3.0

1. n. the state of being included
2. n. the act of including
3. n. the relation of comprising something
4. n. any small intracellular body found within another (characteristic of certain diseases)