Definition of "Speculation" :

noun: continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature

noun: a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)

"Speculations about the outcome of the election."

noun: a message expressing an opinion based on incomplete evidence

noun: an investment that is very risky but could yield great profits

"He knew the stock was a speculation when he bought it."