Looking for the definition of ESP? Find out what is the full meaning of ESP on Abbreviations.com! 'Encapsulating Security Payload' is one option -- get in to view more @ The Web's largest and most authoritative acronyms and abbreviations resource. ESP or Encapsulating security payload is an individual protocol in IPSec. ESP is responsible for the CIA triad of security (Confidentiality, Integrity, Availability), which is considered significant only when encryption is carried along with them. Get ESP full form and full name in details. Visit to know long meaning of ESP acronym and abbreviations. It is one of the best place for finding expanded names. ESP . definition: 1. written abbreviation for especially 2. abbreviation for extrasensory perception 3. abbreviation…. Learn more.