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The Collaborative International Dictionary
Supposititiously

Supposititious \Sup*pos`i*ti"tious\, a. [L. suppositicus. See Supposition.]

  1. Fraudulently substituted for something else; not being what is purports to be; not genuine; spurious; counterfeit; as, a supposititious child; a supposititious writing.
    --Bacon.

  2. Suppositional; hypothetical. [R.]
    --Woodward. [1913 Webster] -- Sup*pos`i*ti"tious*ly, adv. -- Sup*pos`i*ti"tious*ness, n.