An entrée (/ˈɒ̃treɪ/, US also /ɒnˈtreɪ/; French: [ɑ̃tʁe]) in modern French table service and that of much of the English-speaking world (apart from the United States and parts of Canada) is a dish served before the main course of a meal. Outside North America, it is generally synonymous with the terms hors d'oeuvre, appetizer, or starter. It may be the first dish served, or it may follow a soup or other small dish or dishes. In the United States and parts of Canada, the term entrée refers to the main dish or the only dish of a meal.
Read more here about the early use of the word 'entrée'.