누나

Etymology
Contracted from, ultimately from pre-Middle Korean "sister" or similar; see  for more. The phonologically conservative and  conserve the original  in this word.

Korean colloquial family terms commonly stem from a fused vocative. See Category:Korean terms suffixed with -아 (vocative).

Noun

 * 1) older sister of a male
 * 2)  somewhat older female friend or acquaintance
 * 1)  somewhat older female friend or acquaintance
 * 1)  somewhat older female friend or acquaintance

Usage notes
This term is used as a de facto second-person pronoun by men to address both older sisters and unrelated women of somewhat older age. This is because Korean does not permit the use of true second-person pronouns towards a social superior. See 너 for more.