En toilette, Fr., in full dress.
Entrée, Fr., a side-dish, served as one course of a meal.
Entre nous, Fr., between ourselves.
Ensemble, Fr., all together.
E pluribus unum, L., one out of many.
Et cetera, L., and everything of the sort.
Et tu, Brute, L., and thou also, Brutus.
Eureka, Gr., I have found it.
Fête, Fr., a festive social occasion.