Śūnyatā, (Sanskrit, also shunyata; Pali: suññatā), is a Buddhist term that is translated into English as emptiness, openness, thusness, etc. Śūnyatā refers to the absence of inherent existence in all phenomena, and it is complementary to the Buddhist concepts of no-self (Pāli: anatta, Sanskrit: anātman) and dependent origination.

The exact definition of emptiness varies from one Buddhist tradition to another.

Read more about Śūnyatā:  Etymology, Development of The Concept, Understanding in Various Buddhist Traditions, Alternate Translations