NOUN (2)

1. (physics) a combining 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;

2. (genetics) a combining of genes or characters different from what they were in the parents;

The Collaborative International Dictionary of English v.0.48:

Recombination \Re*com`bi*na"tion\ (r?*k?m`b?*n?"sh?n), n.
   Combination a second or additional time.
   [1913 Webster]

WordNet (r) 3.0 (2006):

recombination
    n 1: (physics) a combining 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
    2: (genetics) a combining of genes or characters different from
       what they were in the parents