1926, first in reference to Italian fascism, formed in English on model of Italian totalitario "complete, absolute, totalitarian," from total (adj.) + ending from authoritarian. The noun is recorded from 1938.
late 14c., from Old French total (14c.), from Medieval Latin totalis "entire, total" (as in summa totalis "sum total"), from Latin totus "all, all at once, the whole, entire, altogether," a word of unknown origin. Total war is attested from 1937 (William Shirer), in reference to a concept developed in Germany.
"favoring imposed order over freedom," 1862, from authority + -an. Compare authoritative, which originally had this meaning to itself. Noun in the sense of one advocating or practicing the principle of authority over individual freedom is from 1859.
D. Harper. “Etymology of totalitarian.” Online Etymology Dictionary. https://www.etymonline.com/word/totalitarian (accessed $(datetime)).
Definitions of totalitarian
characterized by a government in which the political authority exercises absolute and centralized control; "a totalitarian regime crushes all autonomous institutions in its drive to seize the human soul"- Arthur M.Schlesinger, Jr.;
of or relating to the principles of totalitarianism according to which the state regulates every realm of life;
totalitarian theory and practice
an adherent of totalitarian principles or totalitarian government;