Merriam-Webster's Collegiate® Dictionary, 11th Edition
LEGISLATIVE
I. adjective
Date: 1640
1. having the power or performing the function of legislating, belonging to the branch of government that is charged with such powers as making laws, levying and collecting taxes, and making financial appropriations,
2. of or relating to a legislature , composed of members of a legislature , created by a legislature especially as distinguished from an executive or judicial body, designed to assist a legislature or its members , of, concerned with, or created by legislation , legislatively adverb
II. noun
Date: 1642
the body or department exercising the power and function of legislating ; legislature