From Wiktionary, the free dictionary
я́сен (jásen, “clear, serene”) + -ина (-ina)
яснина́ • (jasniná) f
- abstract noun of я́сен (jásen)
- (dialectal) daybreak, bright part of the morning; clear weather
- “яснина”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
- “яснина”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010