Existentiell and existential are key terms in Martin Heidegger's early philosophy.
The common German word "existenziell" is usually translated into English as "existential".
In English translations of Heidegger, then, the German "existenziell" is transliterated as "existentiell" in English, and the German word "existenzial" is transliterated as "existential", each word having its own technical meaning specific to Heidegger.
[2] In Heidegger's terminology, the being-there of the world (Dasein) cannot be essentially defined "by ascribing to it a 'what' that specifies its material content”.
[7] The above understanding is limited to Dasein alone due to its qualitative distinction from other beings.