Arsis

Origin

Ancient Greek ἄρσις (ársis, "lifting"), from αἴρω (aírō, "I lift").

Full definition of arsis

Noun

1. The stronger part of a musical measure or a metrical foot.
2. (music) The elevation of the hand, or that part of the bar at which it is raised, in beating time; the weak or unaccented part of the bar, opposed to the thesis.