The Council of Carthage in 397 is the earliest canon of scripture we have that matches what is used today if Roman Catholic and some Protestant Churches. The canon of the Church of the East is earlier.
The wording from that council may help clarify the term canon.
It was also determined that besides the Canonical Scriptures nothing be read in the Church under the title of divine Scriptures. The Canonical Scriptures are these: Genesis, Exodus, Leviticus, Numbers, Deuteronomy, Joshua the son of Nun, Judges, Ruth, four books of Kings, 3 two books of Paraleipomena, 4 Job, the Psalter, five books of Solomon, 5 the books of the twelve prophets, Isaiah, Jeremiah, Ezechiel, Daniel, Tobit, Judith, Esther, two books of Esdras, 6 two books of the Maccabees. Of the New Testament: four books of the Gospels, one book of the Acts of the Apostles, thirteen Epistles of the Apostle Paul, one epistle of the same [writer] to the Hebrews, two Epistles of the Apostle Peter, three of John, one of James, one of Jude, one book of the Apocalypse of John. Let this be made known also to our brother and fellow-priest Boniface, or to other bishops of those parts, for the purpose of confirming that Canon. because we have received from our fathers that those books must be read in the Church. Let it also be allowed that the Passions of Martyrs be read when their festivals are kept.
So the canonical scriptures are those to be read in the church under the title “divine scriptures.”
http://www.bible-researcher.com/carthage.html