The following are SharePoint Dictionary Words of the Day Related to Feature:
Feature
Functionality which can be activated or deactivated at a
site, site collection, web application and farm level.
Feature definition
XML fragment which defines a feature and attributes.
Feature identifier
A GUID which identifies a feature that is available in an environment.
Feature property
Property which is associated with an active feature at a
particular scope.
Feature scope
Scope at which a feature can be activated or deactivated.