Etymology
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figment (n.)
early 15c., "something invented or imagined, a myth or fable; deceitful practice; false doctrine," from Latin figmentum "something formed or fashioned, creation," related to figura "shape" (from PIE root *dheigh- "to form, build"). Related: Figmental; figmentary.
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*dheigh- 
Proto-Indo-European root meaning "to form, build."

It forms all or part of: configure; dairy; dey (n.1) "female servant, housekeeper, maid;" disfigure; dough; effigy; faineant; faint; feign; feint; fictile; fiction; fictitious; figment; figure; figurine; lady; paradise; prefigure; thixotropy; transfigure.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dehah "body," literally "that which is formed," dih- "to besmear;" Greek teikhos "wall;" Latin fingere "to form, fashion," figura "a shape, form, figure;" Old Irish digen "firm, solid," originally "kneaded into a compact mass;" Gothic deigan "to smear," Old English dag, Gothic daigs "dough."
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non-entity (n.)

also nonentity, c. 1600, "something which does not exist, a figment," from non- + entity. Meaning "a person or thing of no consequence or importance" is attested from 1710.

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