àrìsùn noun /à.ɾì.sũ̀/
àìsùn (alternative), àrìhùn (alternative), àìhùn (alternative)
Definitions
  1. eve, vigil; the night preceding a traditional festival, consisting of song and dance throughout the night Ekiti
Etymology
From àrì- (“negative nominalizing prefix”) + sùn (“to sleep”), literally “The act of not sleeping”
Component words
àrì-negative nominalizing prefixsùnto sleep
Source: Wiktionary, where this word is spelled “arisun”. Reference: en-arisun-yo-noun-DLC1QuZu