Source : Webster's Revised Unabridged Dictionary (1913)

Tenth \Tenth\, a. [From {Ten}: cf. OE. tethe, AS. te['o]?a. See
   {Ten}, and cf. {Tithe}.]
   1. Next in order after the ninth; coming after nine others.

   2. Constituting or being one of ten equal parts into which
      anything is divided.

Tenth \Tenth\, n.
   1. The next in order after the ninth; one coming after nine
      others.

   2. The quotient of a unit divided by ten; one of ten equal
      parts into which anything is divided.

   3. The tenth part of annual produce, income, increase, or the
      like; a tithe. --Shak.

   4. (Mus.) The interval between any tone and the tone
      represented on the tenth degree of the staff above it, as
      between one of the scale and three of the octave above;
      the octave of the third.

   5. pl. (Eng. Law)
      (a) A temporary aid issuing out of personal property, and
          granted to the king by Parliament; formerly, the real
          tenth part of all the movables belonging to the
          subject.
      (b) (Eccl. Law) The tenth part of the annual profit of
          every living in the kingdom, formerly paid to the
          pope, but afterward transferred to the crown. It now
          forms a part of the fund called Queen Anne's Bounty.

Source : WordNet®

tenth
     n 1: a tenth part; one part in ten [syn: {one-tenth}, {tenth part},
           {ten percent}]
     2: position ten in a countable series of things

tenth
     adj : coming next after the ninth and just before the eleventh in
           position [syn: {10th}]