Does the phrase “in good standing” have a definition in Catholicism?
The term as such is not in Canon Law. So a definition has to be found in different channels within the Church.
Basically speaking a Catholic in good standing is a practicing (practical) Catholic!
The Knights of Columbus employ this phrase in defining what is the definition of a practical ...
It's not a term used in canon law.
Canonist Charles Augustine, O.S.B., uses the the phrase "good standing" in his commentary on canon law, but it doesn't appear anywhere in the code of canon law itself.
The OED defines "to be in good standing with" as "to stand well with, be in favour with". Thus, a Catholic in good standing is ...