pertaining to, dealing with, or regulating expense or expenditure.
2.
intended to regulate personal habits on moral or religious grounds.
Origin: 1590–1600; < L sūmptuārius, equiv. to sūmptu(s) spending, expense (sūm(ere) to take, procure (see consume) + intrusive -p- + -tus suffix of v. action) + -ārius-ary