noun /əˈmend.mənt,ʌˈmɛnd.mənt/
a) An alteration or change for the better; correction of a fault or of faults; reformation of life by quitting vices.
The First Amendment guarantees freedom of religion, speech, press, assembly, and petition.
b) In public bodies; Any alteration made or proposed to be made in a bill or motion that adds, changes, substitutes, or omits.
The Thirteenth Amendment to the United States Constitution abolished slavery.
Wikipedia foundation.