En grande tenue is a French term referring to a formal dress code. It is often used in official or ceremonial settings and indicates a particular level of dress code. Some synonyms for en grande tenue include "black tie," "white tie," and "formal dress." These terms are commonly used in English as dressing guidelines for formal events such as weddings, black-tie galas or award ceremonies. Another synonym for en grande tenue could be "evening dress," which generally means women should wear long dresses and men should wear black tuxedos. Whatever term is used, it is essential to follow the appropriate dress code to ensure you remain in keeping with the dress code at the event.