n. the branch of biotechnology that uses biological processes to overcome environmental problems. [ WordNet 1.6 ]
n. The act of coming between; intervention; mediation; interposition. Burke. [ 1913 Webster ]
n. [ OE. mediacioun, F. médiation. See Mediate, a. ]
The soul [ acts ] by the mediation of these passions. South. [ 1913 Webster ]