LATIN DICTIONARYLexicon Latīnum
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“assiduity” in Latin

The English word assiduity itself goes back to Latin assideō, through assiduitas.

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

assiduity
assiduitas (continued, uninterrupted exertion): sedulitas (indefatigable bustling activity in small matters): diligentia (careful and close application): industria (industry of a high and elevatedkind). Vid: INDUSTRY.

Quick answer

What is the Latin word for assiduity?
The usual Latin words for “assiduity” are assiduitās, sēdulitās, dīligō; also industria. 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.