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

subsidiary \subsid"iary\, n.; pl. subsidiaries.
   one who, or that which, contributes aid or additional
   supplies; an assistant; an auxiliary. --hammond.
   1913 webster
see also:
subsidiaries 

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

subsidiary \subsid"iary\, a. l. subsidiarius: cf. f.
   subsidiaire. see subsidy.
   1. furnishing aid; assisting; auxiliary; helping; tributary;
      especially, aiding in an inferior position or capacity;
      as, a subsidiary stream.
      1913 webster

            chief ruler and principal head everywhere, not
            suffragant and subsidiary.            --florio.
      1913 webster

            they constituted a useful subsidiary testimony of
            another state of existence.           --coleridge.
      1913 webster

   2. of or pertaining to a subsidy; constituting a subsidy;
      being a part of, or of the nature of, a subsidy; as,
      subsidiary payments to an ally.
      1913 webster

            george the second relied on his subsidiary treaties.
                                                  --ld. mahon.
      1913 webster
see also:
subsidy 

[3] : WordNet (r) 2.0

subsidiary
     adj 1: relating to something that is added but is not essential;
            "an ancillary pump"; "an adjuvant discipline to forms
            of mysticism"; "the mind and emotions are auxilliary
            to each other" syn: accessory, adjunct, ancillary,
             adjuvant, appurtenant, auxiliary
     2: functioning in a subsidiary or supporting capacity; "the
        main library and its auxiliary branches" syn: auxiliary,
         supplemental, supplementary
     n 1: an assistant subject to the authority or control of another
          syn: subordinate, underling, foot soldier
     2: a company that is completely controlled by another company
        syn: subsidiary company
see also:
accessory adjunct ancillary adjuvant appurtenant auxiliary 
supplemental supplementary subordinate underling foot soldier 
subsidiary company 

[4] : Moby Thesaurus II by Grady Ward, 1.0

63 moby thesaurus words for "subsidiary":
   accessory, accident, accidental, addendum, addition, additional,
   adjunct, adjuvant, adscititious, adventitious, ancillary,
   appendage, appurtenance, appurtenant, ascititious, assistant,
   assisting, auxiliary, casual, circumstantial, collateral,
   contingency, contingent, contributory, dotal, dower, dowered,
   dowry, endowed, extra, fortuitous, fostering, happenstance,
   helping, incidental, inessential, instrumental, invested,
   mere chance, ministerial, ministering, ministrant, minor,
   nonessential, not-self, nurtural, nutricial, other, pensionary,
   secondary, serving, stipendiary, subordinate to, subservient,
   superadded, superaddition, superfluous, supervenient, supplement,
   supplemental, supplementary, tributary, unessential

Subsidiary >> S Words
Subsidiary, definition of term: Subsidiary
subsidiary_pag1.html

Subsidiary Comp >> S Words
Subsidiary Comp, definition of term: Subsidiary Comp
subsidiary+comp_pag1.html