Basically the issue with the knees is you don't want to start riding a horse too strenuously until the knees close. For each breed it is different. Some close at 3, others, like drafts and WBs, can wait until 5 or so.
the act of making or enacting laws. 2. a law or a body of laws enacted. Origin of legislation.
Noun. 1. legislation-law enacted by a legislative body. statute law. lawmaking, legislating, legislation-the act of making or enacting laws. enabling legislation-legislation that gives appropriate officials the authority to implement or enforce the law.