ex ‧ is ‧ ten ‧ tial ‧ is ‧ m /ˌeɡzɪˈstenʃ ə lɪz ə m/ BrE AmE noun [uncountable] technical
[ Word Family: noun : ↑ existence ≠ ↑ non-existence , ↑ existent , ↑ existentialism , ↑ existentialist , ↑ coexistence ; adjective : ↑ existent ≠ ↑ nonexistent , ↑ existing , ↑ pre-existing , ↑ existential , ↑ existentialist ; verb : ↑ exist , ↑ coexist ]
the belief in ↑ philosophy that people are responsible for their own actions and experiences, and that the world has no meaning
—existentialist adjective
—existentialist noun [countable]