Through. See through, a later form of thorough, now the exclusive form as a preposition and adverb.Through: as, thoroughgoing. See through, adverbGoing through; through, in a literal sense: a form now occurring only in dialectal use or in certain phrases and compounds. See through, adjectiveGoing through, as to the end or bottom of anything; thoroughgoing.Leaving nothing undone; slighting nothing; not superficial.Fully executed; having no deficiencies; hence, complete in all respects; unqualified; perfect.Earnest; ardent. [Rare.]n. That which goes through.n. A furrow between two ridges.n. Same as perpend.n. In Brit. hist., in the reign of Charles I., the policy of Strafford and Laud of conducting or carrying through (‘thorough’) the administration of public affairs without regard to obstacles. Hence the word is associated with their system of tyranny.