Source : Webster's Revised Unabridged Dictionary (1913)

Second \Sec"ond\, n.
   1. One who, or that which, follows, or comes after; one next
      and inferior in place, time, rank, importance, excellence,
      or power.

            Man an angel's second, nor his second long. --Young.

   2. One who follows or attends another for his support and
      aid; a backer; an assistant; specifically, one who acts as
      another's aid in a duel.

            Being sure enough of seconds after the first onset.
                                                  --Sir H.
                                                  Wotton.

   3. Aid; assistance; help. [Obs.]

            Give second, and my love Is everlasting thine. --J.
                                                  Fletcher.

   4. pl. An article of merchandise of a grade inferior to the
      best; esp., a coarse or inferior kind of flour.

   5. [F. seconde. See {Second}, a.] The sixtieth part of a
      minute of time or of a minute of space, that is, the
      second regular subdivision of the degree; as, sound moves
      about 1,140 English feet in a second; five minutes and ten
      seconds north of this place.

   6. In the duodecimal system of mensuration, the twelfth part
      of an inch or prime; a line. See {Inch}, and {Prime}, n.,
      8.

   7. (Mus.)
      (a) The interval between any tone and the tone which is
          represented on the degree of the staff next above it.
      (b) The second part in a concerted piece; -- often
          popularly applied to the alto.

   {Second hand}, the hand which marks the seconds on the dial
      of a watch or a clock.

Source : WordNet®

second hand
     n 1: an intermediate person; used in the phrase `at second hand';
          "he could learn at second hand from books"
     2: hand marking seconds on a timepiece
     adv : from a source of previously owned goods; "I prefer to buy
           second hand"