Let’s go through our options:
An allusion is a casual reference. Not what we are looking for.
A metaphor is comparing something dramatically. Getting closer!
A denotation is basically a definition, that thing in your dictionary. This is really close, but not enough.
A connotation is all that is left, but to double check, we will do a search on Google:
“an idea or feeling that a word invokes”
With the literal definition to support our assumption, the answer is Connotation.
