The Collaborative International Dictionary of English v.0.48:

Deem \Deem\, v. i.
   1. To be of opinion; to think; to estimate; to opine; to
      suppose.
      [1913 Webster]

            And deemest thou as those who pore,
            With aged eyes, short way before?     --Emerson.
      [1913 Webster]

   2. To pass judgment. [Obs.] --Spenser.
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The Collaborative International Dictionary of English v.0.48:

Deem \Deem\ (d[=e]m), v. t. [imp. & p. p. Deemed (d[=e]md); p.
   pr. & vb. n. Deeming.] [OE. demen to judge, condemn, AS.
   d[=e]man, fr. d[=o]m doom; akin to OFries. d[=e]ma, OS.
   ad[=o]mian, D. doemen, OHG. tuommen, Icel. d[ae]ma, Sw.
   d["o]mma, Dan. d["o]mme, Goth. d[=o]mjan. See Doom, n., and
   cf. Doom, v.]
   1. To decide; to judge; to sentence; to condemn. [Obs.]
      [1913 Webster]

            Claudius . . . Was demed for to hang upon a tree.
                                                  --Chaucer.
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   2. To account; to esteem; to think; to judge; to hold in
      opinion; to regard.
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            For never can I deem him less him less than god.
                                                  --Dryden.
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The Collaborative International Dictionary of English v.0.48:

Deem \Deem\, n.
   Opinion; judgment. [Obs.] --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

deem
    v 1: keep in mind or convey as a conviction or view; "take for
         granted"; "view as important"; "hold these truths to be
         self-evident"; "I hold him personally responsible" [syn:
         deem, hold, view as, take for]