or·di·nance 
(ôrdn-əns)
(ôrdn-əns)n.
1. An authoritative command or order.
2. A custom or practice established by long usage.
3. A Christian rite, especially the Eucharist.
4. A statute or regulation, especially one enacted by a municipal government.
[Middle English ordinaunce, from Old French ordenance, from Medieval Latin ōrdinantia, from Latin ōrdināns, ōrdinant-, present participle of ōrdināre, to ordain, from ōrdō, ōrdin-, order; see ar- in the Appendix of Indo-European roots.]