thorough-

prefix

through, passing via

“thoroughfare, thoroughgo, thoroughlane”

Similar
dia-per-
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Meanings

prefix

alternative through-

  1. idiomaticthrough, passing via

    thoroughfare, thoroughgo, thoroughlane

    Synonyms: dia-

  2. idiomaticfully, completely; purely

    thoroughgoingly, thoroughbreed, thoroughpaced

    Synonyms: per-

Synonyms & antonyms

prefixthrough, passing via

Similar
dia-

prefixfully, completely; purely

Similar
per-

Origin

A variant of through-, common in 16th-19th centuries, particularly where there is a perceived connection with thorough “thorough-”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000..

Full word history & related roots →
Cite this entry
APA

thorough-. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/thorough-

MLA

“thorough-.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/thorough-. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “thorough-,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/thorough-.

Source: thorough- on Wiktionary, CC BY-SA 4.0.