Exigence is a requirement or necessity.

ask why when where who

imperfection marked by urgency". It is a defect, an obstacle, a situation that need to be improved.

Exigence, ethos, pathos, logos, Antitheses, Imagery, Personification, Simile, Alliteration, etc.

A rhetorical situation is the context of a rhetorical act, made up (at a minimum) of a rhetor (a speaker or writer), an issue (or exigence), a medium (such as a speech or a written text), and an audience.