ASSIDUITY

assiduity. Assiduity, n. diligence, continued application

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As′si‐du″i‐ty (�), n.; pl. Assiduities (�). [[L. assiduitas: cf. F. assiduite. See Assiduous.]] 1. 1. Constant or close application or attention, particularly to some business or enterprise; diligence.
I have, with much pains and assiduity, qualified myself for a nomenclator. Addison. 2. 2. Studied and persevering attention to a person; — usually in the plural.