n. taking a risk in the hope of a large gain but with recognition of the possibility of a large loss

n. a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence); "speculations about the outcome of the election"; "he dismissed it as mere conjecture"

n. a message expressing an opinion based on incomplete evidence

n. an investment that is very risky but could yield great profits; "he knew the stock was a speculation when he bought it"

n. (game)

n. [investment involving high risk but also the possibility of high profits]