n. [ Trade name. ] 1. the collective trade name for a type of plastic food-storage container with a translucent bottom and a close-fitting lid designed to seal the container tightly. It is in common use in the late 20th century and early 21st century in the U. S. It comes in a variety of shapes and sizes, suitable for storing a variety of items. Also used attributively. She saved the leftovers in a couple of Tupperware containers. [ PJC ]

n. a social gathering at which the host (or more typically hostess) entertains the guests, and provides them with an opportunity to order Tupperware. This was used as an effective sales strategy by the Tupperware manufacturer, and provided income to the host(ess) from commissions on sales. [ PJC ]