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Speculation from WikiPedia:

In finance, speculation is a financial action that does not promise safety of the initial investment along with the return on the principal sum. Speculation typically involves the lending of money or the purchase of assets, equity or debt but in a manner that has not been given thorough analysis or is deemed to have low margin of safety or a significant risk of the loss of the principal investment. The term, "speculation," which is formally defined as above in Graham and Dodd's 1934 text, Security Analysis, contrasts with the term "investment," which is a financial operation that, upon thorough analysis, promises safety of principal and a satisfactory return.

In a financial context, the terms "speculation" and "investment" are actually quite specific. For instance, although the word "investment" is typically used, in a general sense, to mean any act of placing money in a financial vehicle with the intent of producing returns over a period of time, most ventured money—including funds placed in the world's stock markets—is actually not investment, but speculation.

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