ordinance

noun

1. an authoritative rule or law; a decree or command.
2. a public injunction or regulation: a city ordinance against excessive horn blowing.
3. something believed to have been ordained, as by a deity or destiny.
4. Ecclesiastical.
   1. an established rite or ceremony.
   2. a sacrament.
   3. the communion.

noun

1. an authoritative regulation, decree, law, or practice

n.c.1300, “an authoritative direction, decree, or command” (narrower or more transitory than a law), from Old French ordenance (Modern French ordonnance) or directly from Medieval Latin ordinantia, from Latin ordinantem (nominative ordinans), present participle of ordinare “put in order” (see ordain). By early 14c. senses had emerged of “arrangement in ranks or rows” (especially in order of battle), also “warlike provisions, equipment” (a sense now in ordnance).