<p>Do these two nouns have the same meaning ?Are they synonims ?I think they both come from the verb ‘‘ordain’’</p>
<p>(my explanation below is based on dictionary.com)
An ordinance is a regulation or decree (i.e. “The mayor issued an ordinance against jaywalking”). An ordination is the act or event of ordaining…i.e. an ordination ceremony in the Catholic Church in which a man is made a priest.</p>
<p>So they’re similar, but have slightly different nuances…at least, that’s how I take it!</p>