Congrats, you managed to find the dictionary, but didn't even make it to the encyclopedia, let alone the acutal literature.
And now, with just the barest of definition and no deeper knowledge on anything you think you are an expert.
Here, please read at least the wikipedia entry to get a very basic understanding about what the adults in the room are talking about: https://en.wikipedia.org/wiki/Sentience
I'm always astonished when there's a discussion about a topic so deep that it's been hotly debated by philosophers for centuries and someone drops in the dictionary definition thinking they solved the whole discourse with a one-liner from the dictionary.