"disposition to go to extremes in doctrine or practice," 1848, from extreme + -ism.

I would remind you that extremism in the defense of liberty is no vice! And let me remind you also that moderation in the pursuit of justice is no virtue. [Barry Goldwater (1909-1998), acceptance speech as Republican candidate for President, 1963]

"capable of being extricated," 1620s, from extricate + -able. Related: Extricably.

"disentangle, disengage, set free," 1610s, from Latin extricatus, past participle of extricare "disentangle," figuratively "clear up, unravel," perhaps from ex "out of" (see ex-) + tricae (plural) "perplexities, hindrances," which is of unknown origin. Related: Extricated; extricating.

"act of extricating, state of being extricated; disentanglement; act or process of setting loose or free," 1640s, noun of action from extricate (v.).

"not of the essence or inner nature of a thing," 1540s, from French extrinsèque, from Late Latin extrinsecus (adj.) "outer," from Latin extrinsecus (adv.) "outwardly, on the outside; from without, from abroad," from exter "outside" (from ex "out of;" see ex-) + in, suffix of locality, + secus "beside, alongside," originally "following," from PIE *sekw-os "following," suffixed form of root *sekw- (1) "to follow."

"outgoing, overtly expressive person," 1916, extravert (spelled with -o- after 1918, by influence of introvert), from German Extravert, from extra "outside" (see extra-) + Latin vertere "to turn" (from PIE root *wer- (2) "to turn, bend"). Used (with introvert) in English by doctors and scientists in various literal senses since 1600s, but popularized in a psychological sense early 20c. by Carl Jung. Related: Extroverted.