|Origin:||, past participle of speculari 'to watch (secretly)', from specere 'to look (at)'|
1 [intransitive and transitive]
to guess about the possible causes or effects of something, without knowing all the facts or details:
She refused to speculate.
speculate on/about (why/what etc)
Jones refused to speculate about what might happen.
Some analysts speculated that jobs will be lost.
to buy goods, property, shares in a company etc, hoping that you will make a large profit when you sell them
He speculated in stocks.