Traceability (glossary)
The degree to which a relationship can be established between two or more products of the development process, especially products having a predecessor-successor or master-subordinate relationship to one another (IEEE 1233-1998 (R2002) IEEE Guide for Developing System Requirements Specifications, 3.1.9)
Source[s]
IEEE. 1998. IEEE Guide for Developing System Requirements Specifications. New York, NY: Institute of Electrical and Electronics Engineers (IEEE), IEEE 1233-1998.
Discussion
SEVOCAB lists other, similar definitions.