A set of software-intensive systems that share a common, managed set of features satisfying the specific needs of a particular market segment or mission and that are developed from a common set of core assets in a prescribed way.

Clements, P., & Northrop, L. (2001). Software product lines: practices and patterns; SEI Series in Software Engineering, Addison-Wesley. [-]

A set of software-intensive systems sharing a common, managed set of features that satisfy the specific needs of a particular market segment or mission and that are developed from a common set of core assets in a prescribed way.

SEI online SPL Glossary [SEI online SPL Glossary]