1) Inflection 2) Prosody 
lines whose rhythm arises from its stressed syllables rather than from the number of its syllables, or from the length of time devoted to their sounding. Old English poems such as Beowulf and Caedmon's Hymn are accentual. They fall clearly into two halves, each with two stresses.
• (a.) Of or pertaining to accent; characterized or formed by accent.
Ac·cen'tu·al adjective Of or pertaining to accent; characterized or formed by accent. 
[adj] - of or pertaining to accent or stress 2. [adj] - (of verse) having a metric system based on stress rather than syllables or quantity
adjective of or pertaining to accent or stress
of or pertaining to accent or stress. · of or pertaining to poetry based on the number of stresses, as distinguished from poetry depending on the number of syllables or quantities.