Definition of supposititious
1a
: fraudulently substituted : spurious
b
of a child
(1)
: falsely presented as a genuine heir
(2)
: illegitimate
2
[influenced in meaning by supposition]
a
: imaginary
b
: of the nature of or based on a supposition : hypothetical
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Merriam-Webster unabridged
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Time Traveler for supposititious
The first known use of supposititious was in 1600
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