by 1895 (adj.) in philosophy; 1945 (n.); from existential + -ist and in later use from French existentialiste, from existentialisme (1940); see existentialism. Related: Existentialistic.
"tendency to be swayed by sentiment; sentimental habit of mind," 1801, from sentimental + -ism. Originally especially in reference to the philosophy of Rousseau.
in Hindu philosophy and theology, "divine power, active dimension of godhead," from Sanskrit saknoti "is able, is strong," which is said to be from PIE root *kak- "to enable, help."
"member or adherent of a sect," 1550s, from French sectaire or directly from Medieval Latin sectarius, from secta "religious group, sect in philosophy or religion" (see sect).
"truth" (in Hindu philosophy), from Sanskrit sattvah "truth," literally "being," cognate with Gothic sunjis, Old English soð "true" (see sooth).
"of or relating to pleasure," also, "of or having to do with the Cyrenaic school of philosophy," 1650s, from Greek hēdonikos "pleasurable," from hēdone "pleasure" (see hedonist).
masculine or positive principle in Chinese philosophy, 1670s, from Mandarin yang, said to mean "male, daylight, solar," or "sun, positive, male genitals."
1839 as a term in philosophy, from impression + -ism. With reference to the French art movement, 1879, from impressionist. Extended 1880s to music (Debussy), literature, etc.