The Collaborative International Dictionary of English v.0.48:

Adjustment \Ad*just"ment\ (-ment), n. [Cf. F. ajustement. See
   Adjust.]
   1. The act of adjusting, or condition of being adjusted; act
      of bringing into proper relations; regulation.
      [1913 Webster]

            Success depends on the nicest and minutest
            adjustment of the parts concerned.    --Paley.
      [1913 Webster]

   2. (Law) Settlement of claims; an equitable arrangement of
      conflicting claims, as in set-off, contribution,
      exoneration, subrogation, and marshaling. --Bispham.
      [1913 Webster]

   3. The operation of bringing all the parts of an instrument,
      as a microscope or telescope, into their proper relative
      position for use; the condition of being thus adjusted;
      as, to get a good adjustment; to be in or out of
      adjustment.
      [1913 Webster]

   Syn: Suiting; fitting; arrangement; regulation; settlement;
        adaptation; disposition.
        [1913 Webster]

WordNet (r) 3.0 (2006):

adjustment
    n 1: making or becoming suitable; adjusting to circumstances
         [syn: adjustment, accommodation, fitting]
    2: the act of making something different (as e.g. the size of a
       garment) [syn: alteration, modification, adjustment]
    3: the act of adjusting something to match a standard [syn:
       adjustment, registration, readjustment]
    4: the process of adapting to something (such as environmental
       conditions) [syn: adaptation, adaption, adjustment]
    5: an amount added or deducted on the basis of qualifying
       circumstances; "an allowance for profit" [syn: allowance,
       adjustment]