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."