|Origin:||, past participle of surmetre 'to accuse', from Latin supermettere 'to throw on', from mittere 'to send'|
to guess that something is true, using the information you know already
When he came in, he didn't look up, so she surmised that he was in a bad mood.
—surmise noun [uncountable and countable]
Charles was glad to have his surmise confirmed.