speculation

noun

1. 1.The process of thinking or meditating on a subject.
2. 2.The act or process of reasoning a priori from premises given or assumed.
3. 3.A conclusion to which the mind comes by speculating; mere theory; notion; conjecture.
4. 4.An investment involving higher-than-normal risk in order to obtain a higher-than-normal return.
5. 5.The act or practice of buying land, goods, shares, etc., in expectation of selling at a higher price, or of selling with the expectation of repurchasing at a lower price; a trading on anticipated fluctuations in price, as distinguished from trading in which the profit expected is the difference between the retail and wholesale prices, or the difference of price in different markets.