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

pressure \pres"sure\ ?; 138, n. of., fr. l. pressura, fr.
   premere. see 4th press.
   1. the act of pressing, or the condition of being pressed;
      compression; a squeezing; a crushing; as, a pressure of
      the hand.
      1913 webster

   2. a contrasting force or impulse of any kind; as, the
      pressure of poverty; the pressure of taxes; the pressure
      of motives on the mind; the pressure of civilization.
      1913 webster

            where the pressure of danger was not felt.
                                                  --macaulay.
      1913 webster

   3. affliction; distress; grievance.
      1913 webster

            my people's pressures are grievous.   --eikon
                                                  basilike.
      1913 webster

            in the midst of his great troubles and pressures.
                                                  --atterbury.
      1913 webster

   4. urgency; as, the pressure of business.
      1913 webster

   5. impression; stamp; character impressed.
      1913 webster

            all saws of books, all forms, all pressures past.
                                                  --shak.
      1913 webster

   6. mech. the action of a force against some obstacle or
      opposing force; a force in the nature of a thrust,
      distributed over a surface, often estimated with reference
      to the amount upon a unit's area.
      1913 webster

   7. electro-motive force.
      webster 1913 suppl.

   atmospheric pressure, center of pressure, etc. see under
      atmospheric, center, etc.

   back pressure steam engine, pressure which resists the
      motion of the piston, as the pressure of exhaust steam
      which does not find free outlet.

   fluid pressure, pressure like that exerted by a fluid. it
      is a thrust which is normal and equally intense in all
      directions around a point. --rankine.

   pressure gauge, a gauge for indicating fluid pressure; a
      manometer.
      1913 webster
see also:
press atmospheric pressure center of pressure atmospheric center back pressure 
fluid pressure pressure gauge 

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

back \back\, a.
   1. being at the back or in the rear; distant; remote; as, the
      back door; back settlements.
      1913 webster

   2. being in arrear; overdue; as, back rent.
      1913 webster

   3. moving or operating backward; as, back action.
      1913 webster

   back blocks, australian pastoral country which is remote
      from the seacoast or from a river. webster 1913 suppl.
      

   back charges, charges brought forward after an account has
      been made up.

   back filling arch., the mass of materials used in filling
      up the space between two walls, or between the inner and
      outer faces of a wall, or upon the haunches of an arch or
      vault.

   back pressure. steam engine see under pressure.

   back rest, a guide attached to the slide rest of a lathe,
      and placed in contact with the work, to steady it in
      turning.

   back slang, a kind of slang in which every word is written
      or pronounced backwards; as, nam for man.

   back stairs, stairs in the back part of a house; private
      stairs. also used adjectively. see back stairs,
      backstairs, and backstair, in the vocabulary.

   back step mil., the retrograde movement of a man or body
      of men, without changing front.

   back stream, a current running against the main current of
      a stream; an eddy.

   to take the back track, to retrace one's steps; to retreat.
      colloq.
      1913 webster
see also:
back blocks back charges back filling back pressure pressure back rest 
back slang back stairs backstairs backstair back step 
back stream to take the back track 

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