Etymology
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supposititious (adj.)

"put by artifice in place of another," 1610s, from Latin supposititius, from suppositus, past participle of supponere (see suppose).

updated on December 30, 2013

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Definitions of supposititious from WordNet

supposititious (adj.)
based primarily on surmise rather than adequate evidence;
Synonyms: conjectural / divinatory / hypothetical / hypothetic / supposed / suppositional / suppositious
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.