counterpart

noun

1. Either of two parts that fit together, or complement one another.

   “Those brass knobs and their hollow counterparts interlock perfectly.”

   “Mr. Obama never found a generational counterpart among conservatives in Congress like Paul D. Ryan or Eric Cantor; instead, there was a mutual animosity.”

2. A duplicate of a legal document.
3. One who or that which resembles another.
4. One who or that which has corresponding functions or characteristics.

   “Her French counterpart attended the meeting via video call.”

   “The two companies are working together with their respective counterparts in Asia.”

   “Its incompleteness in this respect makes the timetable of less value than some of its Continental counterparts, such as the French Horaires Mayeux; nevertheless, it is fair value at 5s.”

   “England's attacking impetus was limited to one shot from Lampard that was comfortably collected by keeper Iker Casillas, but for all Spain's domination of the ball his England counterpart Joe Hart was unemployed.”

5. Either half of a flattened fossil when the rock has split along the plane of the fossil.

verb

1. (transitive)To counterbalance.