(US) a law, usually one enacted by a municipal body (=town or city)
A city ordinance prohibited the private use of guns within city limits.
(usually: ordinances) a religious rite (=a religious ceremony)
This means that religious ordinances governing marriage, divorce, adoption and inheritance will be subservient to what the Constitution-framed law holds is fair and just.
an authoritative rule or order that must be obeyed
"Approved 102 Option" means an Option granted pursuant to Section 102(b) of the Ordinance and held in trust by a Trustee for the benefit of the Optionee.