hypothesis
- A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation. nounThe scientist formulated a hypothesis to explain the strange phenomenon.Her hypothesis was that the plant would grow faster in direct sunlight.
- An idea or theory that is not proven but that leads to further study or discussion. nounThe hypothesis that life exists on other planets has fascinated scientists for decades.He proposed a hypothesis about the effects of pollution on marine life.