Definition of arsis in English:

arsis

noun

Prosody
  • A stressed syllable or part of a metrical foot in Greek or Latin verse.

    Often contrasted with thesis
    • ‘Comparable to the inversion of geometric patterns, a melodic line could be played in reverse order (temporal thesis) or inverted and presented as the mirror image of the original (temporal arsis).’

Origin

Late Middle English: via late Latin from Greek, literally lifting, from airein raise.

Pronunciation:

arsis

/ˈɑːsɪs/