The act of making a law or laws.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (noun) (n.) (noun)
The act of making a law or laws; the laws so made.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
The act of legislating.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (noun) (n.) (noun)

Usage examples:

How did that act become necessary in the legislation of England, if the previous law had already provided for the same thing?
- Trial of the Officers and Crew of the Privateer Savannah, on the Charge of Piracy, in the United States Circuit Court for the Southern District of New York by A. F. Warburton
The influence of philosophy on the legislation of the Antonines is a commonplace of history.
- Roman Society from Nero to Marcus Aurelius by Samuel Dill
Similarly, we may describe the office of a Parliament as that of averaging the interests of the various classes in a community; and a good Parliament is one in which the parties answering to these respective interests are so balanced, that their united legislation allows to each class as much as consists with the claims of the rest.
- Essays: Scientific, Political, & Speculative, Vol. I by Herbert Spencer