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