Source : Webster's Revised Unabridged Dictionary (1913)

Accentual \Ac*cen"tu*al\, a.
   Of or pertaining to accent; characterized or formed by
   accent.

Source : WordNet®

accentual
     adj 1: of or pertaining to accent or stress
     2: (of verse) having a metric system based on stress rather
        than syllables or quantity; "accentual poetry is based on
        the number of stresses in a line"; "accentual rhythm"
        [ant: {quantitative}, {syllabic}]