existential
Word family
Synonym discussion
Sense: adjective/2
These words all touch serious matters, but they point in different directions. 'Existential' is used when something reaches existence itself, whether that means literal survival or the deepest question of what it means to live. 'Life-and-death' is narrower and more urgent: it focuses on immediate physical survival in war, illness, or disaster. 'Fundamental' means basic or central, but it does not itself suggest danger or human existence. 'Human' is broader and more neutral, covering anything related to people. 'Ontological' is the most technical and belongs mainly to philosophy, where it asks what it means to exist. A flood may be an existential threat to an island, while a budget rule is only a fundamental issue, not an existential one.
Etymology
The word was built in English from 'existence' and the adjective ending '-ial'. The deeper root goes back to Latin 'existere', meaning 'to come into being' or 'stand out'. At first, 'existential' simply meant 'relating to existence'. In modern usage it developed a strong link with existentialist philosophy, and it can also describe what is felt as part of a person's lived reality.
First known use
1656
1656, in the meaning defined at sense 1