CUSTOMARY (adj)

1. according to or depending on custom; usual; habitual.
2. of or established by custom rather than law.
3. Law. defined by long-continued practices: the customary service due from land in a manor.
–n.
4. a book or document containing the legal customs or customary laws of a locality.
5. any body of such customs or laws.
—Syn. 1. wonted, accustomed, conventional, common, regular. See usual.
—Ant. 1. uncommon.

* Excerpted from the Random House Webster's Unabridged Dictionary 3.0.