The Collaborative International Dictionary of English v.0.48:

Rely \Re*ly"\ (r?-l?"), v. i. [imp. & p. p. Relied (-l?d"); p.
   pr. & vb. n. Relying.] [Pref. re- + lie to rest.]
   To rest with confidence, as when fully satisfied of the
   veracity, integrity, or ability of persons, or of the
   certainty of facts or of evidence; to have confidence; to
   trust; to depend; -- with on, formerly also with in.
   [1913 Webster]

         Go in thy native innocence; rely
         On what thou hast of virtue.             --Milton.
   [1913 Webster]

         On some fond breast the parting soul relies. --Gray.
   [1913 Webster]

   Syn: To trust; depend; confide; repose.
        [1913 Webster]

WordNet (r) 3.0 (2006):

rely
    v 1: have confidence or faith in; "We can trust in God"; "Rely
         on your friends"; "bank on your good education"; "I swear
         by my grandmother's recipes" [syn: trust, swear,
         rely, bank] [ant: distrust, mistrust, suspect]