1.any venturesome undertaking especially one with an uncertain outcome
2.an investment that is very risky but could yield great profits;
he knew the stock was a speculation when he bought it
3.a commercial undertaking that risks a loss but promises a profit
1.proceed somewhere despite the risk of possible dangers;
We ventured into the world of high-tech and bought a supercomputer
2.put forward, of a guess, in spite of possible refutation;
I am guessing that the price of real estate will rise again
3.put at risk;
I will stake my good reputation for this