The meaning of PEER is one that is of equal standing with another : equal; especially : one belonging to the same societal group especially based on age, grade, or status. How to use peer in a sentence.

The Pacific Earthquake Engineering Research Center (PEER) is a nine-campus research center headquartered at the University of California, Berkeley, working to develop, validate, and disseminate performance-based seismic design technologies for buildings and infrastructure to meet the diverse economic and safety needs of land owners and society.