simple past tense and past participle of suppose
"I supposed you were already home, but I see your car is still in the driveway."
In plain English: To suppose means to think something is true even though you haven't seen proof yet.
"He supposed that the meeting had been canceled."
required or under orders
"I'm supposed to be there at ten"
"he was supposed to go to the store"
based primarily on surmise rather than adequate evidence
"theories about the extinction of dinosaurs are still highly conjectural"
"the supposed reason for his absence"
"suppositious reconstructions of dead languages"
"hypothetical situation"
Presumed to be true, but without proof
"Everyone acts like he's the boss of the company, though I've never actually seen him sign a contract or issue any orders."
In plain English: Supposed means something that people believe is true or should happen, even if it hasn't actually happened yet.
"The supposed expert turned out to be a total fraud."
Usage: Use "supposed" as an adjective before a noun or after the verb to be when referring to something believed to be true based on general expectation rather than confirmed fact. This form often carries a nuance of doubt or irony regarding whether that belief is actually correct, distinguishing it from the adverbial use meaning intended for someone else.
Derived from Old French suposé, which comes from Latin suppositus (past participle of supponere), meaning "placed under" or "put beneath." The term originally referred to something physically supported and later evolved to mean assumed as true without proof.