[1] : The Collaborative International Dictionary of English v.0.48

relief \relief"\ r?-l?f", n. oe. relef, f. relief, properly,
   a lifting up, a standing out. see relieve, and cf.
   basrelief, rilievi.
   1. the act of relieving, or the state of being relieved; the
      removal, or partial removal, of any evil, or of anything
      oppressive or burdensome, by which some ease is obtained;
      succor; alleviation; comfort; ease; redress.
      1913 webster

            he sees the dire contagion spread so fast,
            that, where it seizes, all relief is vain. --dryden.
      1913 webster

   2. release from a post, or from the performance of duty, by
      the intervention of others, by discharge, or by relay; as,
      a relief of a sentry.
      1913 webster

            for this relief much thanks; 'tis bitter cold.
                                                  --shak.
      1913 webster

   3. that which removes or lessens evil, pain, discomfort,
      uneasiness, etc.; that which gives succor, aid, or
      comfort; also, the person who relieves from performance of
      duty by taking the place of another; a relay.
      1913 webster

   4. feudal law a fine or composition which the heir of a
      deceased tenant paid to the lord for the privilege of
      taking up the estate, which, on strict feudal principles,
      had lapsed or fallen to the lord on the death of the
      tenant.
      1913 webster

   5. sculp.  arch. the projection of a figure above the
      ground or plane on which it is formed.
      1913 webster

   note: relief is of three kinds, namely, high relief
         altorilievo, low relief, basso-rilievo, and
         demirelief mezzo-rilievo. see these terms in the
         vocabulary.
         1913 webster

   6. paint. the appearance of projection given by shading,
      shadow, etc., to any figure.
      1913 webster

   7. fort. the height to which works are raised above the
      bottom of the ditch. --wilhelm.
      1913 webster

   8. physical geog. the elevations and surface undulations of
      a country. --guyot.
      1913 webster

   relief valve, a valve arranged for relieving pressure of
      steam, gas, or liquid; an escape valve.
      1913 webster

   syn: alleviation; mitigation; aid; help; succor; assistance;
        remedy; redress; indemnification.
        1913 webster
see also:
relieve basrelief rilievi high relief altorilievo low relief 
basso-rilievo demirelief mezzo-rilievo relief valve 

[2] : WordNet (r) 2.0

relief valve
     n : a valve in a container in which pressure can build up as a
         steam boiler; it opens automatically when the pressure
         reaches a dangerous level syn: safety valve, escape
         valve, escape cock, escape
see also:
safety valve escape valve escape cock escape 

Relief Valve >> R Words
Relief Valve, definition of term: Relief Valve
relief+valve_pag1.html

Relief >> R Words
Relief, definition of term: Relief
relief_pag1.html

Valve >> V Words
Valve, definition of term: Valve
valve_pag1.html

Relief Map >> R Words
Relief Map, definition of term: Relief Map
relief+map_pag1.html

Safety Valve >> S Words
Safety Valve, definition of term: Safety Valve
safety+valve_pag1.html

Tricuspid Valve >> T Words
Tricuspid Valve, definition of term: Tricuspid Valve
tricuspid+valve_pag1.html

Ball Valve >> B Words
Ball Valve, definition of term: Ball Valve
ball+valve_pag1.html

Bas Relief >> B Words
Bas Relief, definition of term: Bas Relief
bas+relief_pag1.html

Bicuspid Valve >> B Words
Bicuspid Valve, definition of term: Bicuspid Valve
bicuspid+valve_pag1.html

Globe Valve >> G Words
Globe Valve, definition of term: Globe Valve
globe+valve_pag1.html

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