Definition: Used loosely, a tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further observation, investigation and/or experimentation. As a scientific term of art, see the attached quotation. Compare to theory, and quotation given there.

Alright class, settle down now, let's take a look today, At a word quite important, in a scientific way! It’s called a hypothesis , listen close and you will see, It’s more than just a guess, it’s an idea meant to be free. The dictionary says, with words precise and neat, “A tentative conjecture,” oh so sweet! It's like saying, "I think this might be true," An explanation offered, for something new. Perhaps you notice leaves are turning gold and brown, Your hypothesis could be: “Autumn’s coming down!” It explains an observation, a sight we understand, But it needs to be tested, across the land! We can test it with questions, investigations keen, Through careful watching, or experiments seen. Think of it as a starting point, you see, A question that's waiting for evidence to agree. Now, remember this closely, don’t you delay, A hypothesis is tested – come what may! It’s different from a theory , that’s something we will explore, But both are important, wanting knowledge to pour. Do you have any questions about this concept bright? Let's discuss it together with all your might!