ààjìn noun /àà.d͡ʒĩ̀/
àjìjẹ̀n (alternative), àjìnjìn (alternative)
Definitions
  1. postmidnight (2am to 4am) idiomatic
Etymology
Contraction of àjìnjìn, ultimately from à- (nominalizing prefix) + jìnjìn (partial reduplication of jìn (“to be deep”)), literally “deep into the night”.
Component words
à-jìnjìn
Source: Wiktionary, where this word is spelled “aajin”. Reference: en-aajin-yo-noun-CXcchHwh