Extensible Firmware Interface definition in Computer Security terms:
Definition(s): A specification for the interface between the operating system and the platform firmware. Version 1.10 of the EFI specifications was the final version of the EFI specifications, and subsequent revisions made by the Unified EFI Forum are part of the UEFI specifications.
Source(s): NIST SP 800-147
NIST SP 800-147B
reference: CSRC Glossary