"the act of extorting, the act or of wresting anything from a person by force, duress, menace, authority, or any undue exercise of power, oppressive or illegal exaction," c. 1300, from Latin extortionem (nominative extortio) "a twisting out, extorting," noun of action from past-participle stem of extorquere "wrench out, wrest away, to obtain by force," from ex "out" (see ex-) + torquere "to twist" (from PIE root *terkw- "to twist").
word-forming element used in forming nouns from Latin words ending in -atus, -atum (such as estate, primate, senate). Those that came to English via French often arrived with -at, but an -e was added after c. 1400 to indicate the long vowel. The suffix also can mark adjectives formed from Latin past participles in -atus, -ata (such as desolate, moderate, separate); again, they often were adopted in Middle English as -at, with an -e appended after c. 1400.
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Harper, D. (n.d.). Etymology of extortionate. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/extortionate