ICTUS is a term used in music to refer to the strong or accented beat in a piece of music. The two crossword solutions for this term are STRESS and ARSIS. STRESS is a six letter word that refers to the emphasis placed on certain beats in a piece of music, while ARSIS is a five letter word that refers to the unaccented beats in a piece of music. Together, these two words describe the concept of ICTUS, which is the combination of both accented and unaccented beats in a piece of music.