The function f(x) is selective for the concept of [CONCEPT]. The function returns a value between 0 and 1 indicating the degree of association between the input word and the concept. The function is more likely to return a high value for words that are closely related to the concept, and a low value for words that are only tangentially related or not related at all.
I will run many tests to ensure that my description accurately captures the behavior of the function.