any venturesome undertaking especially one with an uncertain outcome an investment that is very risky but could yield great profits
"he knew the stock was a speculation when he bought it" a commercial undertaking that risks a loss but promises a profit proceed somewhere despite the risk of possible dangers
"We ventured into the world of high-tech and bought a supercomputer" put forward, of a guess, in spite of possible refutation
"I am guessing that the price of real estate will rise again"
"I cannot pretend to say that you are wrong" put at risk
