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]

The Collaborative International Dictionary of English v.0.48:

Undivided \Un`di*vid"ed\, a.
   1. Not divided; not separated or disunited; unbroken; whole;
      continuous; as, plains undivided by rivers or mountains.
      [1913 Webster]

   2. Not set off, as a share in a firm; not made actually
      separate by division; as, a partner, owning one half in a
      firm, is said to own an undivided half so long as the
      business continues and his share is not set off to him.
      [1913 Webster]

   3. Not directed or given to more than one object; as,
      undivided attention or affection. --Shak.
      [1913 Webster]

   4. (Bot.) Not lobed, cleft, or branched; entire.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Undivided \Undivided\
   See divided.

WordNet (r) 3.0 (2006):

undivided
    adj 1: not parted by conflict of opinion; "presented an
           undivided front"
    2: not shared by or among others; "undivided responsibility"
    3: not divided among or brought to bear on more than one object
       or objective; "judging a contest with a single eye"; "a
       single devotion to duty"; "undivided affection"; "gained
       their exclusive attention" [syn: single(a), undivided,
       exclusive]
    4: not separated into parts or shares; constituting an undivided
       unit; "an undivided interest in the property"; "a full share"