Webster's English Dictionary

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fiduciary

1. fi.du.ciary \f*-'d(y)u:-she--.er-e-, fi--, -sh*-re-\ n : one that holds 
   a fiduciary relation or acts in a fiduciary capacity 
2. fiduciary aj [L fiduciarius, fr. fiducia confidence, trust, fr. fidere] 
   : of, relating to, or involving a confidence or trust : as  : held or 
   founded in trust or confidence  : holding in trust  : depending on public 
   confidence for value or currency {~ fiat m oney}