definition of
speculation

[1] #1 speculation n. [guess, conjecture, supposition, surmise, surmisal, hypothesis] a message expressing an opinion based on incomplete evidence. wn

[2] #2 speculation n. [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". wn

[3] #3 speculation n. [venture] an investment that is very risky but could yield great profits; "he knew the stock was a speculation when he bought it". wn

[4] #4 speculation n. [meditation] 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". wn