The Latin term 'lex' is a three-letter word meaning 'LAW'. It is derived from the Latin word 'lex', which means 'LAW' or 'STATUTE'. Lex is often used in legal contexts to refer to a body of laws, such as a constitution or a code of conduct. In Roman LAW, lex was used to refer to a STATUTE or edict issued by the Roman Senate or emperor. Lex is also used in modern legal systems to refer to a body of laws or regulations.