Apostasy - Abandonment of one’s religious faith, a political party, one’s principles, or a cause.
Apostolic - [ul]
[li]Of or relating to an apostle.[/li][li]Of, relating to, or contemporary with the 12 Apostles. [/li][li]Of, relating to, or derived from the teaching or practice of the 12 Apostles. [/li][li]Of or relating to a succession of spiritual authority from the 12 Apostles, regarded by Anglicans, Roman Catholics, Eastern Orthodox, and some others to have been perpetuated by successive ordinations of bishops and to be requisite for valid orders and administration of sacraments. [/li][li]Roman Catholic Church. Of or relating to the pope as the successor of Saint Peter; papal. [/li][/ul]
To me, these seem to be diametrically opposite meanings. Yet they look like they come from a common root. Does anyone have any info on the history of this?