Webster's English Dictionary

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subsidiary

1. sub.sid.iary \s*b-'sid-e--.er-e-, -'sid-*-re-\ aj [L subsidiarius, fr. 
   subsidium reserve troops] 1a: furnishing aid or support : AUXILIARY  1b: of 
   secondary importance : TRIBUTARY  2: of, relating to, or constituting a 
   subsidy 
2. subsidiary n : one that is subsidiary; esp : a company wholly controlled 
   by ano ther