形容詞 existential:

1. derived from experience or the experience of existence- John Dewey
   同義詞：experiential
2. of or as conceived by existentialism
3. relating to or dealing with existence (especially with human existence)

ex.is.ten.tial

adj.（形容詞）
Of, relating to, or dealing with existence.
存在的：關(guān)于或涉及存在的
Based on experience; empirical.
根據(jù)經(jīng)驗的；全憑觀察和實驗的
Of or as conceived by existentialism or existentialists:
經(jīng)驗主義的：由經(jīng)驗主義或經(jīng)驗主義者所構(gòu)想的：
例句：
an existential moment of choice.
存在判斷的選擇時刻

【引伸】
ex.isten.tially
adv.（副詞）