There are several tests for polysemy, but one of them is zeugma: if one word seems to exhibit zeugma when applied in different contexts, it is likely that the contexts bring out different polysemes of the same word. If the two senses of the same word do not seem to "fit," yet seem related, then it is likely that they are polysemous. This test again depends on speakers' judgments about relatedness, which means that it is not infallible, but merely a helpful conceptual aid.