Sup·pos·i·ti·tious a.
1. Fraudulently substituted for something else; not being what is purports to be; not genuine; spurious; counterfeit; as, a supposititious child; a supposititious writing.
2. Suppositional; hypothetical. [R.]
-- Sup*pos*i*ti*tious*ly, adv. -- Sup*pos*i*ti*tious*ness, n.
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