transactor

from WordNet (r) 3.0 (2006)
transactor
    n 1: someone who conducts or carries on business or negotiations
from The Collaborative International Dictionary of English v.0.48
Transactor \Trans*act"or\, n. [L.]
   One who transacts, performs, or conducts any business.
   --Derham.
   [1913 Webster]
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