Means A figure of speech which calls into question the proper meaning of a word
Comes From Greek ἀφορισμός, aphorismós, "a marking off,' "distinction" or "definition", also "rejection, banishment"
Use Rather than using the word in the sentence I offer two examples of an aphorismus in action. The latter is NSFW due to language but generally regarded as culturally fundamental as the former. :-)
"For you have but mistook me all this while.
I live with bread like you, feel want,
Taste grief, need friends: subjected thus,
How can you say to me I am a king?"
Shakespeare, Richard II Act 3, scene 2, 174-177