Well, you know, it looks good, but . . . discrete means, separate, as in, non-continuous, not part of; individually distinct. So, if X is discrete, then X doesn't have a connection to "the group". That's what makes it discrete. But . . . both 'entity' and 'discrete' express the meaning distinct, which makes the phrase 'discrete entity' somewhat semantically redundant, to me at least.EX: "This company functions as a discrete entity in the group".