"Archangel" - from the Greek - "The First Herald", "The Highest Messenger", the most significant one.
Also: "The Beginning", i.e. "The Beginning", "The First", "The Most Ancient".
"Archangel" - This is the Supreme Divine Messianic Revelation of the entirety of the Truth of God's Will, evangelized originally by Melchizedek, Patriarchs and Prophets, and fully embodied in the Teaching and in the holiness of the life of Jesus Christ.
"Archangel" is an image, a characteristic of Jesus Christ, who embodied in His holy life the fullness of the Wisdom of the eternal Divine Covenants, and thus revealed Himself the spiritual "Image" and "Likeness" of God and proclaimed in the Gospel Teaching the original Messianic saving Revelation of the Will of God.