A caesura is a break in a conversation, a line of verse, or a song. Usually, a caesura means total silence, but not for long.
A caesura is a pause, or an interruption. In musical notation, a caesura is a break in the music, which can be a good time for a trumpet player to catch his breath. A caesura is also a break in the middle of a line of poetry. It is sometimes marked by a question mark, exclamation point, or period, as in the Sylvia Plath poem “Mirror”: “I think it is a part of my heart. But it flickers."