activate

activate (http://definr.com/activate)

     v 1: actuate; "trigger a reaction" [syn: trip, actuate, trigger,
           set off, spark off, spark, trigger off, {touch
          off}]
     2: make active or more active; "activate an old file" [ant: inactivate]
     3: make more adsorptive; of metals
     4: aerate (sewage) so as to favor the growth of organisms that
        decompose organic matter [syn: aerate]
     5: make (substances) radioactive