The Collaborative International Dictionary of English v.0.48:

Focus \Fo"cus\, v. t. [imp. & p. p. Focused; p. pr. & vb. n.
   Focusing.]
   To bring to a focus; to focalize; as, to focus a camera. --R.
   Hunt.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

focused \focused\ adj. [Also spelled focussed.]
   1. being in focus or brought into focus; clearly delineated;
      -- of an image. Opposite of unfocused.
      [WordNet 1.5]

   2. converging on a point; -- of light rays; as, focused light
      rays can set something afire.
      [WordNet 1.5]

   3. concentrated on or clustered around a central point or
      purpose.

   Syn: centered, centred, centralized.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

concentrated \concentrated\ adj.
   1. Having a high density of (the indicated substance); as, a
      narrow thread of concentrated ore.

   Note: [Narrower terms: undiluted (vs. diluted)]
         [WordNet 1.5]

   2. Gathered together or made less diffuse; as, their
      concentrated efforts; his concentrated attention. Opposite
      of distributed or diffused.

   Note: [Narrower terms: bunched, bunchy, clustered;
         centered, centred, centralized, focused;
         undivided] [Also See: compact.]
         [WordNet 1.5]

   3. Intense; in an extreme degree; -- of mental phenomena; as,
      her concentrated passion held them at bay.
      [WordNet 1.5]

   4. being the most concentrated solution possible at a given
      temperature; unable to dissolve still more of a substance.
      Opposite of dilute or unsaturated.

   Note: [Narrower terms: supersaturated]

   Syn: saturated.
        [WordNet 1.5]

   5. reduced to a stronger or more concentrated form; as,
      concentrated sulfuric acid. Opposite of diluted.

   Syn: condensed.
        [WordNet 1.5]

   6. characterized by intensity; especially when imposed from
      without; -- of actions; as, concentrated study.

   Syn: intensive.
        [WordNet 1.5]

   7. characterized by mental concentration.

   Syn: intent.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

focused
    adj 1: being in focus or brought into focus [syn: focused,
           focussed] [ant: unfocused, unfocussed]
    2: (of light rays) converging on a point; "focused light rays
       can set something afire" [syn: focused, focussed]
    3: of an optical system (e.g. eye or opera glasses) adjusted to
       produce a clear image