Source : Webster's Revised Unabridged Dictionary (1913)

Similar \Sim"i*lar\, a. [F. similaire, fr. L. similis like,
   similar. See {Same}, a., and cf. {Simulate}.]
   1. Exactly corresponding; resembling in all respects;
      precisely like.

   2. Nearly corresponding; resembling in many respects;
      somewhat like; having a general likeness.

   3. Homogenous; uniform. [R.] --Boyle.

   {Similar figures} (Geom.), figures which differ from each
      other only in magnitude, being made up of the same number
      of like parts similarly situated.

   {Similar rectilineal figures}, such as have their several
      angles respectively equal, each to each, and their sides
      about the equal angles proportional.

   {Similar solids}, such as are contained by the same number of
      similar planes, similarly situated, and having like
      inclination to one another.

Similar \Sim"i*lar\, n.
   That which is similar to, or resembles, something else, as in
   quality, form, etc.

Source : WordNet®

similar
     adj 1: marked by correspondence or resemblance; "similar food at
            similar prices"; "problems similar to mine"; "they
            wore similar coats" [ant: {dissimilar}]
     2: having the same or similar characteristics; "all politicians
        are alike"; "they looked utterly alike"; "friends are
        generaly alike in background and taste" [syn: {alike(p)},
        {like}] [ant: {unalike}]
     3: resembling or similar; having the same or some of the same
        characteristics; often used in combination; "suits of like
        design"; "a limited circle of like minds"; "members of the
        cat family have like dispositions"; "as like as two peas
        in a pod"; "doglike devotion"; "a dreamlike quality" [syn:
         {like}] [ant: {unlike}]
     4: (of words) expressing closely related meanings
     5: capable of replacing or changing places with something else;
        "interchangeable parts" [syn: {exchangeable}, {interchangeable},
         {standardized}, {standardised}]