Source : Webster's Revised Unabridged Dictionary (1913)

Secondhand \Sec"ond*hand`\, a.
   1. Not original or primary; received from another.

            They have but a secondhand or implicit knowledge.
                                                  --Locke.

   2. Not new; already or previously or used by another; as, a
      secondhand book, garment.

   {At second hand}. See {Hand}, n., 10.

Source : WordNet®

secondhand
     adv : by indirect means; "I heard about it only secondhand or
           thirdhand"; "he prefers to buy secondhand"

secondhand
     adj 1: derived from what is primary or original; not firsthand; "a
            secondhand report"; "a secondhand account of a memory
            of something once read"; "most of our knowledge is
            secondhand"
     2: previously used or owned by another; "bought a secondhand
        (or used) car" [syn: {used}]