From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( a.) Alt. of Empirical

(2): ( n.) One who confines himself to applying the results of mere experience or his own observation; especially, in medicine, one who deviates from the rules of science and regular practice; an ignorant and unlicensed pretender; a quack; a charlatan.

(3): ( n.) One who follows an empirical method; one who relies upon practical experience.

The Nuttall Encyclopedia [2]

The name given to any who practises an art from the mere experience of results, apart from all reference to or knowledge of the scientific explanation.