名詞 existentialism:

1. (philosophy) a 20th-century philosophical movement chiefly in Europe; assumes that people are entirely free and thus responsible for what they make of themselves
   同義詞：existential philosophy, existentialist philosophy

ex.is.ten.tial.ism

n.Philosophy （名詞）【哲學(xué)】
A philosophy that emphasizes the uniqueness and isolation of the individual experience in a hostile or indifferent universe, regards human existence as unexplainable, and stresses freedom of choice and responsibility for the consequences of one`s acts.
存在主義：一種強(qiáng)調(diào)在懷有敵意或冷漠的世界中個(gè)人經(jīng)歷的獨(dú)特性和孤立性的哲學(xué)，它認(rèn)為人的存在是不可解釋的，并強(qiáng)調(diào)選擇的自由和對(duì)自己行為的結(jié)果負(fù)責(zé)

【引伸】
ex.isten.tialist
adj.（形容詞）
n.（名詞）