The Latin root word *cred* means "believe." This Latin root is the word origin of a good number of English vocabulary words, including [*cred*]it, [*cred*]o, and [*cred*]entials. The Latin root word *cred* is easily recalled through the English word in[*cred*]ible, for if something in[*cred*]ible happens it can hardly be "believed."