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"

Moby Thesaurus II by Grady Ward, 1.0:

74 Moby Thesaurus words for "undivided":
   a certain, allied, an, any, any one, assembled, associated, atomic,
   banded together, bound, bracketed, collected, complete,
   concentrated, conjoined, connected, copulate, coupled, devoted,
   either, entire, exclusive, fixed, full, gathered, hand-in-glove,
   hand-in-hand, incorporated, individual, indivisible, intact,
   integral, integrated, intimate, irreducible, joined, knotted,
   leagued, linked, lone, matched, mated, merged, monadic, monistic,
   one, paired, simple, single, singular, sole, solid, solitary,
   spliced, tied, unanalyzable, unbroken, unclipped, uncropped, uncut,
   undiminished, undistracted, uniform, unique, unitary, united,
   unreduced, unseparated, unsevered, unshorn, unswerving, wedded,
   whole, yoked



Bouvier's Law Dictionary, Revised 6th Ed (1856):

UNDIVIDED. That which is held by the same title by two or more persons,
whether their rights are equal, as to value or quantity, or unequal.
     2. Tenants in common, joint-tenants, and partners, hold an undivided
right in their respective properties, until partition has been made. The
rights of each owner of an undivided thing extends over the whole and every
part of it, totum in toto, et totum in qualibet parte. Vide Partition; Per
my et per tout.