IPA: //koʊdɪˈfɛndənt//
KK: /koʊdɪˈfɛndənt/
A person who is accused in a legal case along with one or more other people.
The codefendant pleaded not guilty to the charges against them.
Codefendant → It is formed from "co-" (meaning together) and "defendant" (from Latin "defendere", meaning to defend). The word refers to a person who is being defended in a legal case alongside another person, hence, a co-defendant.
Think of 'together' ('co-') with someone who is 'defending' themselves in court — that's why a codefendant is someone who is being defended alongside another.