S: (n) speculation, conjecture (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"
S: (n) speculation, venture (an investment that is very risky but could yield great profits) "he knew the stock was a speculation when he bought it"
S: (n) meditation, speculation (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"