Features represent the first level of the decomposition of Epics. Features are then further broken down into user stories and the user stories are then grouped into Service Feature Groups. Features are the main major unit of work that teams follows through and in most cases, it takes the development from at least a few feature groups.
AASF™ Requirements Planning
AASF™ Team Responsibilities
Agilest® AAPO™ - Adaptive-Agile™ Product Owner