The underlying idea of this card is "being fruitful." The Empress is the great MOTHER principle in nature.
Some decks depict her as being visibly pregnant, or even with a baby in her lap.
The Empress advises, "If you want something to grow, be patient with it, baby it, pay attention to it, and be willing to let it take its first steps when it's ready to do so."
Rachel Pollack says that this card stands for "pure emotion."