Aaronites

Descendants of Aaron the high priest, so called 1 Chronicles 12:27; 27:17. Thirteen cities were assigned to them, in Judah and Benjamin, Joshua 21:13-19; 1 Chronicles 6:57-60.

Source: ATS Bible Dictionary
Aaronites

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 Chronicles 12:27). Eleazar (Numbers 3:32), and at a later period Zadok (1 Chronicles 27:17), was their chief.

Source: Easton's Bible Dictionary
Aaronites

(1 Chronicles 12:27) priests of the family of Aaron.

Source: Smith's Bible Dictionary