Strong's #104: 'iggra' (pronounced ig-er-aw')

(Aramaic) of Persian origin; an epistle (as carried by a state courier or postman):--letter.

Brown-Driver-Briggs Hebrew Lexicon:

ּ (Aramaic)

'iggerâ'

1) letter, missive (Aramaic loan-word used in last OT books)

Part of Speech: noun feminine

Relation: of Persian origin

Usage:

This word is used 3 times:

 

Ezra 4:8: "and Shimshai the scribe wrote a letter against Jerusalem to Artaxerxes"
Ezra 4:11: "This is the copy of the letter that they sent unto Artaxerxes"
Ezra 5:6: "The copy of the letter that Tatnai, governor on this side and Shethar-boznai,"