inside

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An inner or interior part.
• noun Inward character, perceptions, or feelings.
• noun An inner side or surface.
• noun The part away from the edge; the middle part.
• noun The inner organs; entrails.
• noun The inner parts or workings.
• noun Slang Confidential or secret information.
• adjective Inner; interior.
• adjective Relating to, known to, or coming from an exclusive group.
• adjective Baseball Passing on the side of home plate nearer the batter. Used of a pitch.
• adverb Into or in the interior; within.
• adverb On the inner side.
• adverb Slang In prison.
• preposition Within.
• preposition On the inner side or part of.
• preposition Into the interior of.
• idiom (inside out) With the inner surface turned out; reversed.
• idiom Informal (inside out) As completely as possible; thoroughly.
• idiom (on the inside) In a position of confidence or influence.

from The Century Dictionary.

• Of space: To, into, or in the interior; within.
• Of time or space: Within the limit: followed by of.
• In the interior of; within: as, inside the circle; inside the letter.
• noun In field hockey, the position between the center and the wings.
• noun The inner side or part; the interior, as opposed to the outside or exterior: as, the inside of the hand; the inside of a house; the inside of a newspaper.
• noun plural Interior parts or appurtenances; things within.
• noun An inside passenger in a vehicle.
• Being on the inside; inner; interior; internal: as, an inside view; an inside seat in a coach.

from the GNU version of the Collaborative International Dictionary of English.

• adverb Within the sides of; in the interior; contained within
• adjective Being within; included or inclosed in anything; contained; interior; internal
• adjective Adapted to the interior.
• adjective (Mech.) callipers for measuring the diameters of holes, etc.
• adjective (Arch.) a general term for the final work in any building necessary for its completion, but other than unusual decoration; thus, in joiner work, the doors and windows, inside shutters, door and window trimmings, paneled jams, baseboards, and sometimes flooring and stairs; in plaster work, the finishing coat, the cornices, centerpieces, etc.,; in painting, all simple painting of woodwork and plastering.
• adjective the inner part of a race course; hence, colloquially, advantage of place, facilities, contacts, etc., in competition.
• noun The part within; interior or internal portion; content.
• noun The inward parts; entrails; bowels; hence, that which is within; private thoughts and feelings.
• noun Colloq. Eng. An inside passenger of a coach or carriage, as distinguished from one upon the outside.
• noun a name give to newspaper sheets printed on one side with general and miscellaneous matter, and furnished wholesale to offices of small newspapers, where the blank pages are filled up with recent and local news.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The interior or inner part.
• noun The side of a curved road, racetrack etc. that has the shorter arc length; the side of a racetrack nearer the interior of the course or some other point of reference.
• noun colloquial (in the plural) The interior organs of the body, especially the guts.
• noun dated, UK, colloquial A passenger within a coach or carriage, as distinguished from one upon the outside.
• preposition Within the interior of something, closest to the center or to a specific point of reference.
• adverb Within or towards the interior of something, especially a building.
• adverb colloquial In prison.
• adjective Originating from or arranged by someone inside an organisation.
• adjective baseball A pitch that is toward the batter as it crosses home plate.