Merriam-Webster Collegiate Dictionary - caesura

 noun  (plural -suras or ~e)  Etymology: Late Latin, from Latin, act of cutting, from caedere to cut  Date: 1556  1. in modern prosody a usually rhetorical break in the flow of sound in the middle of a line of verse  2. Greek & Latin prosody a break in the flow of sound in a verse caused by the ending of a word within a foot  3. break, interruption  4. a pause marking a rhythmic point of division in a melody  • ~l adjective