LATIN DICTIONARYLexicon Latīnum
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“inroad” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

inroad
Hostile incursion, incursio: irruptio. To make an inroad, incursionem or irruptionem facere. To make inroads, incursiones hostiliter facere: to prevent the incursions of the enemy, prohibere hostem ab incursionibus (Caes.): he promised to make no incursions into their territory, eorum fines se non violaturum promisit (Caes.).
IMPROPR., Encroachment, attack (Vid :), imminutio alicujus rei (a lessening of it; e.g., dignitatis). To make inroads on anything, violare aliquid (e.g., jus); violare atque imminuere (e.g., officium, jus, etc.). To make an inroad on one of the people’s immemorial privileges, quod populi semper proprium fuit... imminuere, or mutare (Cic.).

Quick answer

What is the Latin word for inroad?
The usual Latin words for “inroad” are incursiō, irruptiō, dignitās; also iūs. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.