Merriam-Webster's Collegiate® Dictionary, 11th Edition
STIPULATE
I. verb (-lated; -lating)
Etymology: Latin stipulatus, past participle of stipulari to demand a guarantee (from a prospective debtor)
Date: circa 1624
intransitive verb to make an agreement or covenant to do or forbear something ; contract , to demand an express term in an agreement, transitive verb to specify as a condition or requirement (as of an agreement or offer), to give a guarantee of, stipulator noun
II. adjective
Etymology: New Latin stipula
Date: circa 1776
having stipules