In a bilateral manner; on both sides: as, a bilaterally symmetrical larva.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. so as to involve two sides or parts
ad. with the involvement of two parties or governments
Word Usage
"The official said he was encouraged that Mr. Wen advocated resolving the issue through dialogue with claimant countries but didn't mention the word "bilaterally" as Chinese officials normally do when discussing the matter."