speculation

(noun) a message expressing an opinion based on incomplete evidence. Synonyms: guess, conjecture, supposition, surmise, surmisal, hypothesis.

(noun) a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence). Synonyms: conjecture. Examples: "Speculations about the outcome of the election." "He dismissed it as mere conjecture."

(noun) an investment that is very risky but could yield great profits. Synonyms: venture. Example: "He knew the stock was a speculation when he bought it."

(noun) continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature. Synonyms: meditation. Example: "The habit of meditation is the basis for all real knowledge."