Etymology
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modify (v.)

late 14c., modifien, "alter, amend, adjust, change the properties, form, or function of;" also "set limits, keep within the bounds of reason; choose a middle course," from Old French modifier (14c.), from Latin modificare "to limit, measure off, restrain," from modus "measure, manner" (from PIE root *med- "take appropriate measures") + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Related: Modified; modifying.

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modifier (n.)

1580s, "one who or that which modifies," agent noun from modify. Grammatical sense of "word, phrase, or clause which modifies another" is from 1865.

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unmodified (adj.)
1792, from un- (1) "not" + past participle of modify (v.).
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transmogrify (v.)
"to change completely," 1650s, apparently a perversion of transmigure, from transmigrate, perhaps influenced by modify. Related: Transmogrified; transmogrifying.
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modification (n.)

c. 1500, in philosophy, "determination by a mode or quality," from French modification (14c.) and directly from Latin modificationem (nominative modificatio) "a measuring," noun of action from past-participle stem of modificare (see modify). Sense of "a result of a variation or alteration" is from 1660s. Meaning "act or process of altering in character, form, or function" is from 1774.

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*med- 

Proto-Indo-European root meaning "take appropriate measures."

It forms all or part of: accommodate; accommodation; commode; commodious; commodity; empty; immoderate; immodest; Medea; medical; medicament; medicaster; medicate; medication; medicine; medico; medico-; meditate; meditation; Medusa; meet (adj.) "proper, fitting;" mete (v.) "to allot;" modal; mode; model; moderate; modern; modest; modicum; modify; modular; modulate; module; modulation; mold (n.1) "hollow shape;" mood (n.2) "grammatical form indicating the function of a verb;" must (v.); premeditate; premeditation; remedial; remediation; remedy.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit midiur "I judge, estimate;" Avestan vi-mad- "physician;" Greek mēdomai "be mindful of," medesthai "think about," medein "to rule," medon "ruler;" Latin meditari "think or reflect on, consider," modus "measure, manner," modestus "moderate," modernus "modern," mederi "to heal, give medical attention to, cure;" Irish miduir "judge;" Welsh meddwl "mind, thinking;" Gothic miton, Old English metan "to measure out."

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*dhe- 

*dhē-, Proto-Indo-European root meaning "to set, put."

It forms all or part of: abdomen; abscond; affair; affect (v.1) "make a mental impression on;" affect (v.2) "make a pretense of;" affection; amplify; anathema; antithesis; apothecary; artifact; artifice; beatific; benefice; beneficence; beneficial; benefit; bibliothec; bodega; boutique; certify; chafe; chauffeur; comfit; condiment; confection; confetti; counterfeit; deed; deem; deface; defeasance; defeat; defect; deficient; difficulty; dignify; discomfit; do (v.); doom; -dom; duma; edifice; edify; efface; effect; efficacious; efficient; epithet; facade; face; facet; facial; -facient; facile; facilitate; facsimile; fact; faction (n.1) "political party;" -faction; factitious; factitive; factor; factory; factotum; faculty; fashion; feasible; feat; feature; feckless; fetish; -fic; fordo; forfeit; -fy; gratify; hacienda; hypothecate; hypothesis; incondite; indeed; infect; justify; malefactor; malfeasance; manufacture; metathesis; misfeasance; modify; mollify; multifarious; notify; nullify; office; officinal; omnifarious; orifice; parenthesis; perfect; petrify; pluperfect; pontifex; prefect; prima facie; proficient; profit; prosthesis; prothesis; purdah; putrefy; qualify; rarefy; recondite; rectify; refectory; sacrifice; salmagundi; samadhi; satisfy; sconce; suffice; sufficient; surface; surfeit; synthesis; tay; ticking (n.); theco-; thematic; theme; thesis; verify.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dadhati "puts, places;" Avestan dadaiti "he puts;" Old Persian ada "he made;" Hittite dai- "to place;" Greek tithenai "to put, set, place;" Latin facere "to make, do; perform; bring about;" Lithuanian dėti "to put;" Polish dziać się "to be happening;" Russian delat' "to do;" Old High German tuon, German tun, Old English don "to do."

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attemper (v.)
late 14c., "reduce, moderate, modify; restrain, control; make fit or suitable; mix in just proportion," from Old French atemprer "become moderate, regulate one's actions, take the middle way," from Latin attemperare, from assimilated form of ad "to" (see ad-) + temperare "to mix in due proportion, modify, blend; restrain oneself" (see temper (v.)). Related: Attempered; attempering.
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retrofit (v.)

"modify so as to incorporate changes made in later versions of the same model," 1954 (U.S. Air Force), from retro- + fit (v.). Related: Retrofitted; retrofitting. As a noun, "modification made to a product," 1956, from the verb.

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tempera (n.)
also tempra, 1832, from Italian tempera (in phrase pingere a tempera), back-formation from temperare "to mix (colors); temper," from Latin temperare "to mix in due proportion, modify, blend; restrain oneself" (see temper (v.)).
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