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early 13c., "betterment, improvement;" c.1300, of persons, "correction, reformation," from Old French amendment, from amender (see amend). Sense expanded to include "correction of error in a legal process" (c.1600) and "alteration of a writ or bill" to remove its faults (1690s).
in government and law, an addition or alteration made to a constitution, statute, or legislative bill or resolution. Amendments can be made to existing constitutions and statutes and are also commonly made to bills in the course of their passage through a legislature. Since amendments to a national constitution can fundamentally change a country's political system or governing institutions, such amendments are usually submitted to an exactly prescribed procedure