From BiblePortal Wikipedia

Smith's Bible Dictionary [1]

A-i'ath. (feminine of Ai ). A place named by Isaiah,  Isaiah 10:28, in connection with Migron and Michmash probably the same as Ai .

Holman Bible Dictionary [2]

 Isaiah 10:28Ai

Hastings' Dictionary of the Bible [3]

Aiath ,   Isaiah 10:28;

Morrish Bible Dictionary [4]

 Isaiah 10:28 . See AI.

International Standard Bible Encyclopedia [5]

ā´yath ( איּת , ‛ayyāth ): Found in  Isaiah 10:28; feminine form of the city Ai (which see).

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [6]

another form ( Isaiah 10:28) of the name of the city Ai (q.v.).