Source : Webster's Revised Unabridged Dictionary (1913)

Recombination \Re*com`bi*na"tion\ (r?*k?m`b?*n?"sh?n), n.
   Combination a second or additional time.

Source : WordNet®

recombination
     n 1: (genetics) a combining of genes or characters different from
          what they were in the parents
     2: (physics) a combinng of charges or transfer of electrons in
        a gas that results in the neutralization of ions;
        important for ions arising from the passage of high-energy
        particles