·adj Irregular; changeable.
II. Erratic ·noun A Rogue.
III. Erratic ·adj Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct.
IV. Erratic ·noun One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character.
V. Erratic ·noun Any stone or material that has been borne away from its original site by natural agencies; ·esp., a large block or fragment of rock; a bowlder.
VI. Erratic ·adj Having no certain course; roving about without a fixed destination; wandering; moving;
— hence, applied to the planets as distinguished from the fixed stars.