Assiduity

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

Noun

1.

assiduity - great and constant diligence and attention Synonyms: assiduousness, concentration

advertence, advertency, alertness, application, ardor, assiduousness, attention, attention span, attentiveness, awareness, bulldog tenacity, care, concentration, consciousness, consideration, constancy, diligence, dogged perseverance, doggedness, ear, earnestness, endurance, energeticalness, energy, engrossment, fervor, fidelity, heed, heedfulness, indefatigability, industriousness, industry, insistence, insistency, intentiveness, intentness, laboriousness, loyalty, mindfulness, note, notice, observance, observation, obstinacy, pains, painstaking, painstakingness, patience, patience of Job, permanence, perseverance, persistence, persistency, pertinaciousness, pertinacity, plodding, plugging, preoccupation, regard, regardfulness, relentlessness, remark, resolution, respect, sedulity, sedulousness, single-mindedness, singleness of purpose, slogging, stability, stamina, staying power, steadfastness, steadiness, stick-to-itiveness, strenuousness, stubbornness, tenaciousness, tenacity, thoroughgoingness, thoroughness, thought, tirelessness, unremittingness, unsparingness, unswerving attention, vehemence, zealousness