Main Entry: sup·pos·i·ti·tious

Pronunciation: \sə-ˌpä-zə-ˈti-shəs\

Function: adjective

Etymology: Latin suppositicius, from suppositus, past participle of supponere to substitute

Date: 1610

1 a : 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

— sup·pos·i·ti·tious·ly adverb