Etymology
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opine (v.)

mid-15c., opinen, "express an opinion or opinions; to think, suppose," also transitive, "be of the opinion that," from Old French oppiner, opiner (15c.) and directly from Latin opinari "have an opinion, be of opinion, suppose, conjecture, think, judge," which is of unknown origin. It is traditionally considered to be related to optare "to desire, choose" (see option), but de Vaan's sources find the evidence of this weak. Related: Opined; opining.

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deign (v.)

c. 1300, deinen, "think worthy, think well of, regard as suited to one's dignity," from Old French deignier (Modern French daigner) and directly from Latin dignari "to deem worthy or fit" (source of Italian degnare, Spanish deñar), from dignus "worthy," from PIE root *dek- "to take, accept." Sense of "take or accept graciously" led to that of "condescend" (1580s), with an infinitive for an object. Related: Deigned; deigning.

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incogitable (adj.)
"unthinkable, inconceivable," 1520s, from Late Latin incogitabilis "unthinking; unthinkable," from in- "not" (see in- (1)) + cogitabilis "thinkable, conceivable," from stem of cogitare "to think" (see cogitation).
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mentation (n.)

"mental function, the action or exercise of the mind" 1839, from Latin ment-, stem of mens "mind" (from PIE root *men- (1) "to think") + -ation. Also "a state of mind."

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philosophize (v.)

"to think and reason about the subjects of philosophy; to meditate upon the fundamental principles of being or knowledge," 1590s, from philosophy + -ize. Related: Philosophized; philosophizing. The earlier verb was simply philosophy (late 14c., philosophien).

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amentia (n.)
"mental deficiency," late 14c., from Latin amentia "madness," from amentem "mad," from a for ab "away from" (see a- (2)) + mentem "mind" (from PIE root *men- (1) "to think") + abstract noun ending -ia.
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Clytaemnestra 
also Clytemnestra, wife and murderess of Agamemnon, from Greek Klytaimnestra, from klytos "celebrated, heard of" (see loud) + mnester "wooer, suitor," literally "willing to mind, mindful of," related to mnasthai "to remember," from PIE root *men- (1) "to think."
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Mesropian (adj.)

in reference to the Armenian and Georgian alphabets, from Mesrob, 5c. patriarch of Armenia, who is said to have devised their basic forms. Scholars think the Georgian was a separate creation from an unknown originator.

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cogitative (adj.)

late 15c., "having the power of thinking or meditating," from Old French cogitatif (14c.), from Medieval Latin cogitativus, from Latin cogitare "to think" (see cogitation). Meaning "thoughtful, given to contemplation" is from 1650s.

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monument (n.)

late 13c., "a sepulchre," from Old French monument "grave, tomb, monument," and directly from Latin monumentum "a monument, memorial structure, statue; votive offering; tomb; memorial record," literally "something that reminds," a derivative of monere "to remind, bring to (one's) recollection, tell (of)," from PIE *moneie- "to make think of, remind," suffixed (causative) form of root *men- (1) "to think." Meaning "any enduring evidence or example" is from 1520s; sense of "structure or edifice to commemorate a notable person, action, period, or event" is attested from c. 1600.

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