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educate: educate: [15] To educate people is literally to ‘lead them out’. The word comes from the past participle of Latin ēducāre, which meant ‘bring up, rear’ as well as more specifically ‘educate’. It was related to ēdūcere ‘lead out’ (source of English educe [15]), a compound verb formed from the prefix ex- ‘out’ and dūcere ‘lead’ (source of English duct, duke, and a whole host of derivatives such as deduce and seduce).
=> conduct, deduce, duct, duke, educe, produce, seduce
reduce: reduce: [14] ‘Lessen, diminish’ is a comparatively recent semantic development for reduce. Its Latin ancestor was certainly not used in that sense. This was redūcere, a compound verb formed from the prefix re- ‘back, again’ and dūcere ‘lead, bring’ (source of English duct, duke, educate, etc). It meant literally ‘bring back’, hence ‘restore’ and also ‘withdraw’.

The original ‘bring back’ made the journey to English, and even survived into the early 17th century (‘reducing often to my memory the conceit of that Roman stoic’, Sir Henry Wotton, Elements of Architecture 1624). The sense ‘lessen, diminish’ seems to be the result of a semantic progression from ‘bring back to a particular condition’ via ‘bring back to order’ and ‘bring to subjection’.
=> duct, duke, educate, introduce, produce, redoubt
redundant: redundant: [17] Etymologically, something that is redundant ‘overflows’ because there is too much of it. The word comes from the present participle of Latin redundāre ‘flow back, overflow’ (source also of English redound [14]). This was a compound verb formed from the prefix re- ‘back, again’ and undāre ‘rise in waves, surge’, a derivative of unda ‘wave’ (source of English undulate).
=> redound, surround, undulate
schedule: schedule: [14] Late Latin scedula meant ‘small piece of paper’. It was a diminutive form of Latin sceda ‘papyrus leaf, piece of paper, page’, itself a borrowing from Greek skhedē. By the time it reached English via Old French cedule it had moved on semantically to ‘small piece of paper with writing on it, used as a ticket or label’; and this subsequently developed through ‘supplementary sheet giving a summary, list of additional points, etc’ to any ‘list giving details of what has been arranged’.

Until around 1800 the word was pronounced /sed-/; but then in Britain, apparently under French influence, it changed to /shed-/, while Americans reverted to the original Greek with /sked-/.
aqueduct (n.): 1530s, from Latin aquaeductus "conveyance of water," from aquae, genitive of aqua "water" (see aqua-), + ductus "a leading, conducting," past participle of ducere "to lead" (see duke (n.)).
coeducational (adj.): also co-educational, 1881, from co-education (1852), from co- + education.
credulity (n.): early 15c., from Old French credulité (12c.), from Latin credulitatem (nominative credulitas) "easiness of belief, rash confidence," noun of quality from credulus (see credulous).
credulous (adj.): 1570s, from Latin credulus "that easily believes, trustful," from credere "to believe" (see credo). Related: Credulously; credulousness.
deduce (v.): early 15c., from Latin deducere "lead down, derive" (in Medieval Latin, "infer logically"), from de- "down" (see de-) + ducere "to lead" (see duke (n.)). Originally literal; sense of "draw a conclusion from something already known" is first recorded 1520s, from Medieval Latin. Related: Deduced; deducing.
deduct (v.): early 15c., from Latin deductus, past participle of deducere "lead down, bring away;" see deduce, with which it formerly was interchangeable. Technically, deduct refers to taking away portions or amounts; subtract to taking away numbers. Related: Deducted; deducting.
deductible (adj.): 1610s, "that may be deduced," also "that may be deducted;" from Latin deducere (see deduce) + -ible. As a noun, "deductible thing," by 1927.
deduction (n.): early 15c., "action of deducting," from Middle French déduction or directly from Latin deductionem (nominative deductio), noun of action from past participle stem of deducere (see deduce). Meaning "that which is deducted" is from 1540s. As a term in logic, from Late Latin use of deductio as a loan-translation of Greek apagoge.
deductive (adj.): 1640s, from Latin deductivus, from deduct-, past participle stem of deducere "to deduce" (see deduce). Related: Deductively.
educability (n.): 1821, in phrenology; see educable + -ity.
educable (adj.): 1836, "fit to be educated," 1836, from French éducable; see educate + -able.
educate (v.): mid-15c., "bring up (children), to train," from Latin educatus, past participle of educare "bring up, rear, educate" (source also of Italian educare, Spanish educar, French éduquer), which is a frequentative of or otherwise related to educere "bring out, lead forth," from ex- "out" (see ex-) + ducere "to lead" (see duke (n.)). Meaning "provide schooling" is first attested 1580s. Related: Educated; educating.

According to "Century Dictionary," educere, of a child, is "usually with reference to bodily nurture or support, while educare refers more frequently to the mind," and, "There is no authority for the common statement that the primary sense of education is to 'draw out or unfold the powers of the mind.'"
educated (adj.): 1660s, past participle adjective from educate (v.). As an abbreviated way to say well-educated, attested from 1855. Educated guess first attested 1954.
education (n.): 1530s, "childrearing," also "the training of animals," from Middle French education (14c.) and directly from Latin educationem (nominative educatio) "a rearing, training," noun of action from past participle stem of educare (see educate). Originally of instruction in social codes and manners; meaning "systematic schooling and training for work" is from 1610s.
educational (adj.): 1650s, "due to education;" 1831, "pertaining to education;" from education + -al (1). Related: Educationally.
educationese (n.): "the jargon of school administrators," 1966, from education + -ese.
educationist (n.): "one versed in the theory and practice of education," 1815; see education + -ist.
educative (adj.): "tending to educate, consisting in educating," 1795, from Latin educat-, past participle stem of educare (see educate) + -ive.
educator (n.): 1560s, "one who nourishes or rears;" 1670s, "one who trains or instructs," from Latin educator (in classical Latin, "a foster father," then also "a tutor"), agent noun from past participle stem of educare (see educate). Latin educatrix meant "a nurse."
educe (v.): early 15c., in the literal sense, "to draw out, extract; branch out," from Latin educere "to lead out, bring out" (troops, ships, etc.; see educate). Meaning "bring into view or operation" is from c. 1600. Meaning "to draw a conclusion from data" is from 1837.
educrat (n.): 1968, usually pejorative; first element from education, second from bureaucrat. Said to have been coined by Claude R. Kirk Jr. (1926-2011), governor of Florida 1967-71.
While political leaders and corporate CEOs, focusing as usual on the quarterly return, call for "workers for the new economy," their educational reforms are producing just that: students with a grab-bag of minor skills and competencies and minds that are sadly uneventful, incapable of genuine intellectual achievement and lacking any sense of continuity with the historical and cultural traditions of our society. Their world is small, bleak, and limited; their world will become ours. [David Solway, "The Turtle Hypodermic of Sickenpods," Quebec, 2000]
incredulity (n.): "disbelieving frame of mind," early 15c., from Middle French incrédulité, from Latin incredulitatem (nominative incredulitas), noun of quality from incredulus (see incredible).
incredulous (adj.): "unbelieving," 1570s, from Latin incredulus "unbelieving, incredulous," from in- "not" (see in- (1)) + credulus (see credulous). Formerly also of religious beliefs. Related: Incredulously; incredulousness.
ineducable (adj.): 1884, from in- (1) "not" + educable. Related: Ineducability.
irreducible (adj.): 1530s, from assimilated form of in- (1) "not, opposite of" + reducible. Related: Irreducibly; irreducibility.
maleducation (n.): also mal-education, 1840, from mal- + education.
medulla (n.): hindmost segment of the brain, 1650s, from Latin medulla, literally "marrow," also "pith of plants," of unknown origin, perhaps related to or influenced by medius "middle" (but compare also Old Irish smiur, Welsh mer "marrow"). The word was used in the Latin senses in Middle English. Related: Medular; medullary.
medusa (n.): "jellyfish," 1758, as genus name, from the name of one of the three Gorgons with snakes for hair, whose glance turned to stone him who looked upon it (attested in English from late 14c.). Her name is from Greek Medousa, literally "guardian," fem. present participle of the verb medein "to protect, rule over" (see Medea). The zoological name was chosen by Linnæus, suggested by the creature's long tentacles. Related: Medusoid.
miseducate (v.): 1790, from mis- (1) + educate (v.). Related: Miseducated; miseducating.
miseducation (n.): "wrong or faulty education," 1620s, from mis- (1) + education.
over-educated (adj.): 1788, from over- + educated.
peduncle (n.): 1753, from Modern Latin pedunculus "footstalk," diminutive of pes (genitive pedis) "foot," from PIE root *ped- (1) "a foot" (see foot (n.)).
pedunculated (adj.): 1752, from Modern Latin pedunculatus, from pedunculus (see peduncle).
procedural (adj.): 1876, from procedure + -al (1). Related: Procedurally.
procedure (n.): 1610s, "fact or manner of proceeding," from French procédure "manner of proceeding" (c. 1200), from Old French proceder "to proceed" (see proceed). Meaning "method of conducting business in Parliament" is from 1839.
re-educate (v.): also reeducate, 1808, from re- + educate. Related: Re-educated; re-educating.
reduce (v.): late 14c., "bring back," from Old French reducer (14c.), from Latin reducere "lead back, bring back," figuratively "restore, replace," from re- "back" (see re-) + ducere "bring, lead" (see duke (n.)). Meaning "bring to an inferior condition" is 1570s; that of "bring to a lower rank" is 1640s (military reduce to ranks is from 1802); that of "subdue by force of arms" is 1610s. Sense of "to lower, diminish, lessen" is from 1787. Related: Reduced; reducing.
reducible (adj.): mid-15c.; see reduce + -ible. Compare Old French redusible.
reductio ad absurdum: Latin, literally "reduction to the absurd." Absurdum is neuter of absurdus. See reduction + absurd. The tactic is useful and unobjectionable in proofs in geometry.
reduction (n.): early 15c., "a restoring to a former state; a subjugation" (of a people, etc.), from Middle French reducion (13c., Modern French réduction) and directly from Latin reductionem (nominative reductio) "a leading back, restoration," noun of action from past participle stem of reducere (see reduce). Meaning "diminution, a lessening" is from 1670s; chemical sense of "reversion to a simpler form" is from 1660s.
reductionism (n.): 1948, in philosophy, from reduction in specialized sense in philosophy (1914) + -ism. Related: Reductionist.
reductionist (n.): 1861 and after in various senses, from reduction + -ist. Philosophical sense, related to reductionism is from 1934.
reductive (adj.): 1630s, "that reduces;" 1650s, "that leads or brings back," from Medieval Latin reductivus, from reduct-, past participle stem of Latin reducere (see reduce). Related: Reductively.
redundance (n.): 1610s, from Latin redundantia "an overflowing, superfluity, excess," from redundare (see redundant).
redundancy (n.): c. 1600; see redundant + -ancy. Sense in employment is from 1931, chiefly British.
redundant (adj.): 1590s, from Latin redundantem (nominative redundans), present participle of redundare, literally "overflow, pour over; be over-full;" figuratively "be in excess," from re- "again" (see re-) + undare "rise in waves," from unda "a wave" (see water (n.1)). Of persons, in employment situations, from 1928, chiefly British. Related: Redundantly.