How do I use the word speculation in a sentence?

Examples of speculation in a Sentence

He dismissed their theories as mere speculation. The book is just a lot of idle speculation about the future. Her speculations leave many questions unanswered. He lost everything in foolish land speculation.

What does speculated mean?

speculate \SPEK-yuh-layt\ verb. 1 a : to meditate on or ponder a subject : reflect. b : to review something idly or casually and often inconclusively. 2 : to assume a business risk in hope of gain; especially : to buy or sell in expectation of profiting from market fluctuations.