What is intergrade meaning?

As an AI language model, I can provide the meaning of "intergrade" for you. The term "intergrade" refers to a population of organisms that have characteristics of two or more distinct subspecies or varieties, indicating a hybrid or interbreeding population. This can occur in plants or animals where two populations come into contact and interbreed, resulting in offspring with mixed genetic characteristics. It is a common phenomenon in evolution, and the intergrade population can sometimes form a new subspecies or variety with distinct characteristics.