1. (noun) guess, conjecture, supposition, surmise, surmisal, speculation, hypothesis
a message expressing an opinion based on incomplete evidence
2. (noun) 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"
3. (noun) speculation, venture
an investment that is very risky but could yield great profits
"he knew the stock was a speculation when he bought it"
4. (noun) 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"
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Definition of 'speculation' 
