Etymology
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imagine (v.)

mid-14c., "to form a mental image of," from Old French imaginer "sculpt, carve, paint; decorate, embellish" (13c.), from Latin imaginari "to form a mental picture, picture to oneself, imagine" (also, in Late Latin imaginare "to form an image of, represent"), from imago "an image, a likeness," from stem of imitari "to copy, imitate" (from PIE root *aim- "to copy"). Sense of "suppose, assume" is first recorded late 14c. Related: Imagined; imagining.

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imaginable (adj.)
late 14c., ymaginable, from Old French imaginable and directly from Late Latin imaginabilis, from Latin imaginari "picture to oneself" (see imagine). Related: Imaginably.
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imaginative (adj.)
late 14c., ymaginatyf, "pertaining to imagination; forming images, given to imagining," from Old French imaginatif and directly from Medieval Latin imaginativus, from imaginat-, stem of Latin imaginari "picture to oneself" (see imagine). Meaning "resulting from imagination" is from 1829. Related: Imaginatively; imaginativeness.
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imaginary (adj.)
"not real, existing only in fancy," late 14c., ymaginaire, from imagine + -ary; or else from Late Latin imaginarius "seeming, fancied," also literal, "pertaining to an image," from Latin imaginari "picture to oneself." Imaginary friend (one who does not exist) attested by 1789.
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*aim- 

Proto-Indo-European root meaning "to copy." 

It forms all or part of: emulate; emulation; emulous;  image; imaginary; imagination; imaginative; imagine; imago; imitable; imitate; imitative; imitator; inimitable.

It is the hypothetical source of/evidence for its existence is provided by: Latin imago "image," aemulus "emulous," imitari "to copy, portray, imitate;" Hittite himma- "imitation, substitute."

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image (v.)
late 14c., "to form a mental picture (of something), imagine," from Old French imagier, from image (see image (n.)). Related: Imaged; imaging.
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ideate (v.)
c. 1600, "imagine, form ideas," from idea + -ate (2). From 1862 as "to think." Related: Ideated; ideating.
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megalomania (n.)

"delusions of greatness; a form of insanity in which the subjects imagine themselves to be great, exalted, or powerful personages," 1866, from French mégalomanie; see megalo- "great, exaggerated" + mania "madness."

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fancy (v.)
"take a liking to," 1540s, a contraction of fantasien "to fantasize (about)," from fantasy (n.). Meaning "imagine" is from 1550s. Related: Fancied; fancies; fancying. Colloquial use in fancy that, etc. is recorded by 1813.
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depict (v.)

early 15c., "portray, paint, form a likeness of in color," from Latin depictus, past participle of depingere "to portray, paint, sketch; describe, imagine," from de "down" (see de-) + pingere "to paint" (see paint (v.)). Extended sense of "portray in words, describe" is from mid-15c. Related: Depicted; depicting.

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