Something used to enhance the flavor of food, for example, salt or pepper, especially when added by the eater to taste rather than by the cook.
As a condiment in food, paprika is reputed to be strongly aphrodisiac.
Congressmen gleefully wolfed down every imaginable version of the hot dog – smoked kielbasas, jumbo grillers, Big & Juicy's, kosher dogs and spiced dogs – topped with every imaginable condiment – hot mustard, sweet mustard, jalapenos, spaghetti sauce, regular relish, corn relish, maple syrup salsa and the secret sauce of Rep. Jack Kingston (R-Ga.). ("If I told you the recipe," an aide explained, "I'd have to shoot you.")