Definify.com
Webster 1913 Edition
Supposititious
1.
Fraudulently substituted for something else; not being what is purports to be; not genuine; spurious; counterfeit;
as, a
. supposititious
child; a supposititious
writingBacon.
2.
Suppositional; hypothetical.
[R.]
Woodward.
Sup-posˊi-ti′tious-ly
, adv.
Sup-posˊi-ti′tious-ness
, Noun.
Webster 1828 Edition
Supposititious
SUPPOSITI'TIOUS
,Adj.
Put by trick in the place or character belonging to another; not genuine; as a supposititious child; a supposititious writing.