Definition of Enacting Clause
A clause at the beginning of a statute which states the authority by which it is made. That part of a statute which declares its enactment and serves to identify it as an act of legislation proceeding from the proper legislative authority. Various formulas are used for this clause, such as “Be it enacted by the people of the state of Illinois represented in general assembly,” “Be it enacted by the senate and house of representatives of the United States of America in congress assembled,” “The general assembly do enact,” etc.
That's the definition of Enacting Clause in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.