Based on the outputs of the function for the given inputs, it seems like the function is selectively associating words with a particular concept. The values returned by the function are between 0 and 1, with a value closer to 1 indicating a stronger association with the concept.

In this case, it appears that the function is associating the input words with a concept related to animals. The words "apple" and "banana" have lower values compared to the words "cat," "dog," and "elephant," which suggests they are less associated with the animal concept.

So, the description of the function could be: 

[DESCRIPTION]: The function f(x) selectively associates words with a concept related to animals. The closer the value returned by the function is to 1, the stronger the association with the animal concept.