D defs.my
Entry 2 senses Webster, 1913

Assiduity

· As·si·du·i·ty · IPA /ˌæs.ɪˈdjuː.ɪ.ti/
01 n. Constant or close application or attention, particularly to some business or enterprise; diligence.
pl. Assiduities
  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.