The Collaborative International Dictionary of English v.0.48:
Inside \In"side`\, a.
1. Being within; included or inclosed in anything; contained;
interior; internal; as, the inside passengers of a
stagecoach; inside decoration.
Kissing with inside lip. --Shak.
2. Adapted to the interior.
Inside callipers (Mech.), callipers for measuring the
diameters of holes, etc.
Inside finish (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.
Inside track, the inner part of a race course; hence,
colloquially, advantage of place, facilities, contacts,
etc., in competition.