The Collaborative International Dictionary of English v.0.48:

Chapel \Chap"el\, n. [OF. chapele, F. chapelle, fr. LL. capella,
   orig., a short cloak, hood, or cowl; later, a reliquary,
   sacred vessel, chapel; dim. of cappa, capa, cloak, cape,
   cope; also, a covering for the head. The chapel where St.
   Martin's cloak was preserved as a precious relic, itself came
   to be called capella, whence the name was applied to similar
   paces of worship, and the guardian of this cloak was called
   capellanus, or chaplain. See Cap, and cf. Chaplain.,
   Chaplet.]
   1. A subordinate place of worship; as,
      (a) a small church, often a private foundation, as for a
          memorial;
      (b) a small building attached to a church;
      (c) a room or recess in a church, containing an altar.
          [1913 Webster]

   Note: In Catholic churches, and also in cathedrals and abbey
         churches, chapels are usually annexed in the recesses
         on the sides of the aisles. --Gwilt.
         [1913 Webster]

   2. A place of worship not connected with a church; as, the
      chapel of a palace, hospital, or prison.
      [1913 Webster]

   3. In England, a place of worship used by dissenters from the
      Established Church; a meetinghouse.
      [1913 Webster]

   4. A choir of singers, or an orchestra, attached to the court
      of a prince or nobleman.
      [1913 Webster]

   5. (Print.)
      (a) A printing office, said to be so called because
          printing was first carried on in England in a chapel
          near Westminster Abbey.
      (b) An association of workmen in a printing office.
          [1913 Webster]

   Chapel of ease.
      (a) A chapel or dependent church built for the ease or a
          accommodation of an increasing parish, or for
          parishioners who live at a distance from the principal
          church.
      (b) A privy. (Law)

   Chapel master, a director of music in a chapel; the
      director of a court or orchestra.

   To build a chapel (Naut.), to chapel a ship. See Chapel,
      v. t., 2.

   To hold a chapel, to have a meeting of the men employed in
      a printing office, for the purpose of considering
      questions affecting their interests.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chapel \Chap"el\, v. t.
   1. To deposit or inter in a chapel; to enshrine. [Obs.]
      --Beau. & Fl.
      [1913 Webster]

   2. (Naut.) To cause (a ship taken aback in a light breeze) so
      to turn or make a circuit as to recover, without bracing
      the yards, the same tack on which she had been sailing.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chapel
    n 1: a place of worship that has its own altar
    2: a service conducted in a place of worship that has its own
       altar; "he was late for chapel" [syn: chapel service,
       chapel]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "chapel":
   Lady chapel, amphitheater, arena, assembly hall, auditorium,
   chantry, chapel of ease, chapel royal, concert hall,
   convention hall, dance hall, exhibition hall, gallery, hall,
   lecture hall, meetinghouse, music hall, opera house, oratorium,
   oratory, sacellum, sacrament chapel, sacrarium, school chapel,
   side chapel, stadium, theater



Easton's 1897 Bible Dictionary:

Chapel
   a holy place or sanctuary, occurs only in Amos 7:13, where one
   of the idol priests calls Bethel "the king's chapel."