Etymology
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inimitable (adj.)
late 15c., from Latin inimitabilis "that cannot be imitated," from in- "not, opposite of" (see in- (1)) + imitabilis "imitable" (see imitable). Related: Inimitably.
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inimitability (n.)
1711, from inimitable + -ity. Perhaps from or modeled on French inimitabilité.
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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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