Etymology
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ho-de-ho (interj.)
1932, defined in the "Oxford English Dictionary" as "An exclamation, used as the appropriate response to HI-DE-HI."
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studied (adj.)
1520s, "learned;" c. 1600, "studiously elaborate," past-participle adjective from study (v.).
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Counter-reformation 

"the resurgence of the Catholic Church from mid-16c. to early 17c. in response to the Protestant Reformation," 1840, from counter- + Reformation.

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perseverate (v.)

"repeat a response after the cessation of the original stimulus," by 1909, in psychology, a back-formation from perseveration. Related: Perseverating; perseverative.

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lettered (adj.)
"literate, learned in letters," c. 1300, from letter (n.1). Meaning "inscribed" is from 1660s, from letter (v.).
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reciprocate (v.)

1610s, "to give and return mutually," a back-formation from reciprocation, or else from Latin reciprocatus, past participle of reciprocare "rise and fall, move back and forth; reverse the motion of," from reciprocus "returning the same way, alternating" (see reciprocal). Sense of "cause to move back and forth" is from 1650s; intransitive sense of "move backward and forward" is from 1670s. Meaning "to give or do in response, act in return or response" is from 1820. Related: Reciprocated; reciprocating.

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erudite (adj.)
early 15c., "learned, well-instructed," from Latin eruditus "learned, accomplished, well-informed," past participle of erudire "to educate, teach, instruct, polish," literally "to bring out of the rough," from assimilated form of ex "out" (see ex-) + rudis "unskilled, rough, unlearned" (see rude). Related: Eruditely.
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literati (n.)
"men and women of letters; the learned class as a whole," 1620s, noun use of Latin literati/litterati, plural of literatus/litteratus "educated, learned" (see literate). The proper singular would be literatus (fem. literata), though Italian literato sometimes is used in English.
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panchen 
Tibetian Buddhist title of respect, 1763, abbreviation of pandi-tachen-po, literally "great learned one."
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phototropism (n.)

"innate movement of a plant or other organism in response to the stimulation of light," 1899, based on German phototropie (1892); see photo- + tropism. Related: Phototropic.

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