Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
βιβλιοθήκη library LXX.Esth.2.23
βιβλιοθήκαισ libraries LXX.Ezra.6.1

Liddell-Scott-Jones

βιβλιοθήκη (bibliothēkē) a library G:N-F

βιβλιοθήκη-θήκη, ,

book-case, [Refs 4th c.BC+] (βυβλ-).

__2 library, collection of books, [LXX+2nd c.BC+]; β. ἔμψυχος, of Longinus, [Refs 4th c.AD+]
__3 record-office, registry, [Refs 2nd c.AD+]; β. ἐγκτήσεων [Refs 2nd c.AD+]; β. δημοσίων [λόγων] [Refs 3rd c.AD+]
__4 compilation from various sources, title of works by [Refs 1st c.BC+]

LSJ Scripture Refs: LXX.Esth.2.23