closed

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Having boundaries; enclosed: a closed corridor between the two buildings.
2. adj. Blocked or barred to passage or entry: a closed port.
3. adj. Explicitly limited; restricted: closed membership.
4. adj. Self-contained or self-sufficient: a closed relationship.
5. adj. Barred to the public; conducted in secrecy: a closed session of the judiciary committee.
6. adj. Mathematics Of or relating to a curve, such as a circle, having no endpoints.
7. adj. Mathematics Of or relating to a surface having no boundary curves.
8. adj. Mathematics Of or relating to an interval containing both its endpoints.
9. adj. Mathematics Characterized by or possessing the property by which an operation acting on an element in a set produces an element within the set.
10. adj. Computer Science Of or relating to a file that cannot be accessed.
11. adj. Electricity Allowing electricity to flow or pass: a closed switch.
12. adj. Linguistics Ending in a consonant: a closed syllable.
13. adj. Sports Having the forward foot closer to the intended point of impact with the ball than the rear foot: a closed batting stance.
14. adj. Sports Held or swung with the top or outer edge of the striking face pointing slightly closer to the objective than the lower or inner edge: The club face was closed when it hit the ball, causing a hook.
15. adj. Physics Relating to a model of the universe in which the mass of the universe is sufficient to halt its expansion, and in which its curvature resembles that of a sphere, such that an object moving in a straight line would eventually return to its starting point.

Wiktionary

1. adj. Sealed, made inaccessible or impassable; not open
2. adj. of a store or business Not operating or conducting trade
3. adj. Non public (as in closed source)
4. adj. topology, of a set Having an open complement.
5. adj. mathematics, of a set Such that its image under the specified operation is contained in it.
6. adj. mathematics, logic Lacking a free variable.
7. v. Simple past tense and past participle of close.

GNU Webster's 1913

1. adj. having an opening obstructed.
2. adj. (Math.) of a curve or surface: having no end points or boundary curves; of a set: having members that can be produced by a specific operation on other members of the same set; of an interval: containing both its endpoints.
3. adj. Being in a position to obstruct an opening; -- especially of doors.
4. adj. having skin drawn so as to obstruct the opening; -- used of mouth or eyes. Opposite of open.
5. adj. prenominal requiring union membership; -- of a workplace.
6. adj. closed with shutters.
7. adj. hidden from the public.
8. adj. not open to the general public.
9. adj. unsympathetic; -- of a person's attitude.
10. adj. surrounded by walls.
11. adj. made compact by bending or doubling over.
12. adj. closed or fastened with or as if with buttons.
13. adj. not engaged in activity; -- of an organization or business establishment.

WordNet 3.0

1. adj. with shutters closed
2. adj. not open
3. adj. (set theory) of an interval that contains both its endpoints
4. adj. not open or affording passage or access
5. adj. requiring union membership
6. adj. not having an open mind
7. adj. blocked against entry
8. adj. not open to the general public
9. adj. used especially of mouth or eyes