IPA: /əˈreɪn.mənt/
KK: /əˈreɪn.mənt/
The formal process in which a person is brought before a court to hear the charges against them and enter a plea.
During the arraignment, the judge explained the charges to the defendant.
Arraignment is formed from "arrainer" (from Old French, meaning to summon or call) and the suffix "-ment" (meaning the action or process of). The word refers to the process of calling someone to court to answer a charge.
Think of being 'summoned' ('arrainer') to court for a legal process ('-ment') — that's what arraignment means.