The Institute of Electrical and Electronics Engineers defines the term feature in IEEE 829 as "A distinguishing characteristic of a software item (e.g., performance, portability, or functionality)." 
A system is said to be feature-rich when it has many options and functional capabilities available to the user. Progressive disclosure is a technique applied to reduce the potential confusion caused by displaying a wealth of features at once.
This term is also used in a pejorative fashion where it expresses the view that features are added at the expense of something that's usually considered a basic function.
See also 
- Feature Oriented Programming
- Product Family Engineering
- Progressive disclosure
- Software design
- Software testing
- Application Lifecycle Management
- Software bloat
- IEEE Std. 829-1998
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