Who were the Aaronites?
"Aaronites" is a term used in the King James Version, but not in the revised versions, to translate the proper name Aaron in two instances where it denotes a family and not merely a person (1 Chronicles 12:27; 1 Chronicles 27:17 ).
It is equivalent to the phrases "sons of Aaron," "house of Aaron," frequently used in the Old Testament. According to the books of Josh and Chronicles the "sons of Aaron," were distinguished from the other Levites from the time of Joshua (e.g. Joshua 21:4 , Joshua 21:10 , Joshua 21:13 ; 1 Chronicles 6:54 ).
International Standard Bible Encyclopedia, which is in the public domain (with minor edits).