An imaginable thing is one that can be imagined or pictured clearly in your mind. Something ordinary like a sunny day might be imaginable.
When we talk about something being imaginable, it usually means that the idea of it makes sense to us and doesn't sound completely strange or outlandish. For example, imagine you're planning a road trip and someone says, "I don't know if I can do 1,000 miles in one day." In this case, not doing 1,000 miles in a day might be unimaginable because it's so physically demanding. On the other hand, meeting a friend for coffee is probably imaginable because most people have done that many times before.
In addition to talking about physical things, we can also use "imaginable" to describe abstract ideas or scenarios. For instance, if someone asks you what it would be like to live on another planet, they're probably asking for something entirely unimaginable.
Able to be imagined; conceivable.
