Pronunciation: (thûr'ō, thur'ō),[key] —adj. 1. executed without negligence or omissions: a thorough search. 2. complete; perfect; utter: thorough enjoyment. 3. extremely attentive to accuracy and detail; painstaking: a thorough worker; a thorough analysis. 4. having full command or mastery of an art, talent, etc.: a thorough actress. 5. extending or passing through.
—adv., prep. Archaic.through.
—n. (cap.) Eng. Hist.the administrative policies of the Earl of Stafford and Archbishop Laud during the reign of Charles I: so called because they were uncompromisingly carried out.