Source : Webster's Revised Unabridged Dictionary (1913)

Hundredth \Hun"dredth\, n.
   One of a hundred equal parts into which one whole is, or may
   be, divided; the quotient of a unit divided by a hundred.

Hundredth \Hun"dredth\, a.
   1. Coming last of a hundred successive individuals or units.

   2. Forming one of a hundred equal parts into which anything
      is divided; the tenth of a tenth.

Source : WordNet®

hundredth
     adj : the ordinal number of one hundred in counting order [syn: {centesimal},
            {100th}]
     n 1: position 100 in a countable series of things
     2: one part in a hundred [syn: {one-hundredth}, {one percent}]