What is the definition of something that is fit to be eaten?

The term that defines something as fit to be eaten is "edible." It specifically refers to food that is safe and suitable for human consumption. When a substance is described as edible, it implies that it meets the necessary standards for safety and has not been contaminated or rendered unsafe to eat.

Non-toxic substances are indeed safe in terms of toxicity, but they may not necessarily be food or suitable for eating. Similarly, while palatable refers to food that is pleasant or acceptable in taste, it does not encompass all food that can be eaten; something may be edible but not necessarily enjoyable. Inedible, on the other hand, directly refers to substances that cannot be consumed safely.

Thus, "edible" is the most accurate term for describing food items that are fit for consumption.