Holy Catholic Church is the term, which is included within the Apostle’s Creed, includes all churches, institutions, and doctrines which claim as their basis a continuous tradition of faith and practice extending from the apostles-the claim is contrasted with the Protestant appeals to the Bible alone. Hence Catholic also refers to Christians who accept the traditional doctrines and practices, for example, devotion to Mary and the sacraments.
Perhaps also included within the term catholic are seven epistles, James, 1 and 2 Peter; 1, 2, and 3 John, and Jude, which were addressed to individuals and others, the latter not especially in the Church. These epistles are characterized as containing catholic or universal doctrine, and 1 Peter and 1 John were universally accepted. A.G.H.
Bowker, John, The Oxford Dictionary of World Religions, New York, Oxford University Press, 1997, p. 200
Unger, Merrill F., Unger’s Bible Dictionary, Chicago, Moody Press, 1966, p. 185