A polysemous word is one word with two or more different meanings, and those meanings are related, not a coincidence. Head can be the thing on your neck and the person in charge; both grew from the same word. This is a language-teacher’s word — almost nobody says it at dinner. Though actually, most common English words are polysemous; dictionaries look long because of this, not because English is trying to trick you. Keep it apart from two words that only happen to look or sound the same, like the bank of a river and a money bank. Many teachers call those homonyms, and that is a different story.

多義的、一字多義的