Etymology
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idio- 
word-forming element meaning "one's own, personal, distinct," from Greek idios "own, personal, private, one's own" (see idiom).
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se- 

word-forming element in words of Latin origin, "apart, away," from Latin se-, collateral form of sed- "without, apart, aside," probably originally "by one's self, on one's own," and related to sed, Latin reflexive pronoun (accusative and ablative), from PIE *sed-, extended form of root *s(w)e-, pronoun of the third person and reflexive (source also of German sich; see idiom).

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