[ thur-oh, thuhr-oh ]
/ ˈθɜr oʊ, ˈθʌr oʊ /


adverb, preposition

Archaic. through.


(initial capital letter) English History. 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.

Origin of thorough

before 900; Middle English (preposition and adv.); Old English thuruh, variant of thurh through

OTHER WORDS FROM thorough Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for thorough

British Dictionary definitions for thorough (1 of 2)

/ (ˈθʌrə) /


carried out completely and carefullya thorough search
(prenominal) uttera thorough bore
painstakingly carefulmy work is thorough

Derived forms of thorough

thoroughly, adverbthoroughness, noun

Word Origin for thorough

Old English thurh; related to Old Frisian thruch, Old Saxon thuru, Old High German duruh; see through

British Dictionary definitions for thorough (2 of 2)

/ (ˈθʌrə) /


thoroughgoing policy, as adopted in England by Strafford and Laud during the reign of Charles I
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012