1. （谈判、会议、协议等）双边的
Bilateral negotiations, meetings, or agreements, involve only the two groups or countries that are directly concerned.

1. having two sides or parts

Synonym: two-sided

2. affecting or undertaken by two parties

e.g. a bilateral agreement between the United States and Japan

3. having identical parts on each side of an axis

Synonym: isobilateralbilaterally symmetricalbilaterally symmetric