Assiduity :: Assiduity (n.) Constant or close application or attention, particularly to some business or enterprise; diligence..
Assiduity :: Assiduity (n.) Studied and persevering attention to a person; -- usually in the plural.
Assiduous :: Assiduous (a.) Constant in application or attention; devoted; attentive; unremitting.
Assiduous :: Assiduous (a.) Performed with constant diligence or attention; unremitting; persistent; as, assiduous labor..