Definition of "legacy"
legacy
noun
plural legacies
Something inherited from a predecessor or the past.
Quotations
And judging by how well the progressive and youth-favoured party did, many observers suspect this latest round of legal charges are a response to Future Forward's commitment to undo the legacy of military rule and undertake democratic reforms.
2019 April 6, Caleb Quinley, “Thailand: Anti-military party leader faces sedition charges”, in Al Jazeera, Doha: Al Jazeera, retrieved 2019-04-06
(education) The descendant of an alumnus, given preference in academic admissions.
adjective
Left over from the past; no longer current.
Quotations
However, pre-relational DBMS are legacy.
2003, Carlo Zaniolo, Peter C. Lockemann, Marc H. Scholl, Advances in Database Technology - EDBT 2000
In practice, there are legacy or mature, domain specific, off the shelf (i.e. software that other software projects can reuse and integrate into their own products) tools that are used regularly by modeleres (e.g., for testing purposes, for communication and collaboration).
2013, Management Association, Software Design and Development