Source : Webster's Revised Unabridged Dictionary (1913)

Tenor \Ten"or\, n. [L., from tenere to hold; hence, properly, a
   holding on in a continued course: cf. F. teneur. See
   {Tenable}, and cf. {Tenor} a kind of voice.]
   1. A state of holding on in a continuous course; manner of
      continuity; constant mode; general tendency; course;
      career.

            Along the cool sequestered vale of life They kept
            the noiseless tenor of their away.    --Gray.

   2. That course of thought which holds on through a discourse;
      the general drift or course of thought; purport; intent;
      meaning; understanding.

            When it [the bond] is paid according to the tenor.
                                                  --Shak.

            Does not the whole tenor of the divine law
            positively require humility and meekness to all men?
                                                  --Spart.

   3. Stamp; character; nature.

            This success would look like chance, if it were
            perpetual, and always of the same tenor. --Dryden.

   4. (Law) An exact copy of a writing, set forth in the words
      and figures of it. It differs from purport, which is only
      the substance or general import of the instrument.
      --Bouvier.

   5. [F. t['e]nor, L. tenor, properly, a holding; -- so called
      because the tenor was the voice which took and held the
      principal part, the plain song, air, or tune, to which the
      other voices supplied a harmony above and below: cf. It.
      tenore.] (Mus.)
      (a) The higher of the two kinds of voices usually
          belonging to adult males; hence, the part in the
          harmony adapted to this voice; the second of the four
          parts in the scale of sounds, reckoning from the base,
          and originally the air, to which the other parts were
          auxillary.
      (b) A person who sings the tenor, or the instrument that
          play it.

   {Old Tenor}, {New Tenor}, {Middle Tenor}, different
      descriptions of paper money, issued at different periods,
      by the American colonial governments in the last century.

Source : WordNet®

tenor
     n 1: the adult male singing voice above baritone [syn: {tenor
          voice}]
     2: the pitch range of the highest male voice
     3: an adult male with a tenor voice
     4: pervading note of an utterance; "I could follow the general
        tenor of his argument" [syn: {strain}]

tenor
     adj 1: (of a musical instrument) intermediate between alto and
            baritone or bass; "a tenor sax"
     2: of or close in range to the highest natural adult male
        voice; "tenor voice"