Easton's Bible Dictionary (1897)
The descendants of Aaron, and therefore priests. Jehoiada, the father of Benaiah, led 3,700 Aaronites as “fighting men” to the support of David at Hebron (1 Chr. 12:27). Eleazar (Num. 3:32), and at a later period Zadok (1 Chr. 27:17), was their chief.
Smith's Bible Dictionary (1863)
(1 Chronicles 12:27) priests of the family of Aaron.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
AA'RONITES. 1 Chr 12:27. Levites of the family of Aaron: the priests who served the sanctuary. Eleazar, Aaron's son, was their chief. Num 4:16.