Assiduity

As·si·du·i·ty

Assiduity

n.

pl. Assiduities

  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.
  2. Studied and persevering attention to a person; -- usually in the plural.