给一个单词的拼写，让助手列出它在指定字典中的定义。
单词: hypothesis
字典: 英语词典
hypothesis:

1. a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
2. (in Kantian philosophy) a proposition made as a basis for reasoning, without any assumption of its truth.
3. (in systematic theology) the theory that deals with the idea of God and the divine attributes and their relation to the world.
4. a proposition, or set of propositions, set forth as an explanation for the occurrence of some specified group of phenomena, either asserted merely as a provisional conjecture, to guide investigation (working hypothesis), or accepted as highly probable in the light of established facts.