From Longman Dictionary of Contemporary EnglishP2PP2P /ˌpiː tə ˈpiː/ adjective 1 (peer-to-peer) peer-to-peer computer systems make it possible to exchange files, software etc between two computers, even though they are not connected to each other2 (person-to-person) person-to-person methods of paying for something allow the person buying something on the Internet to pay the person who is selling it P2P paymentsFrom Longman Business DictionaryP2PP2P, P-to-P /ˌpiː tə ˈpiː/ adjective [only before a noun]COMPUTING (peer-to-peer) involving direct communication between computers, without using a main central serverP2P networks are de-centralised, which means that there is no central server that keeps track of all the information in the system.