speculation

noun

1. a message expressing an opinion based on incomplete evidence
2. a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)"speculations about the outcome of the election"
3. an investment that is very risky but could yield great profits"he knew the stock was a speculation when he bought it"
4. continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature"the habit of meditation is the basis for all real knowledge"