- 1[intransitive, transitive] to form an opinion about something without knowing all the details or facts speculate (about/on/as to something) We all speculated about the reasons for her resignation. They were all speculating as to the identity of the stranger. speculate why, how, etc… It is useless to speculate why he did it. speculate that… We can speculate that the stone circles were used in some sort of pagan ceremony.
- 2[intransitive] speculate (in/on something) to buy goods, property, shares, etc., hoping to make a profit when you sell them, but with the risk of losing money He likes to speculate on the stock market.
NAmE//ˈspɛkyəˌleɪt//Verb Forms present simple I / you / we / they speculate
he / she / it speculates
past simple speculated
-ing form speculating