(n.) The state or quality of being intent; close application; attention.

abandon absorbed attention absorption advertence advertency alertness application ardency ardor assiduity assiduousness attention attention span attentiveness awareness care commitment committedness concentration consciousness consideration contemplation dedication deep study deep thought devotedness devotion devoutness diligence ear earnest earnestness engagement engrossment faith faithfulness fervency fervidness fervor fidelity fire heartiness heat heatedness heed heedfulness immersion impassionedness intensity intentiveness involvement loyalty meditation mindfulness monomania note notice observance observation obsession passion passionateness preoccupation profound thought rapt attention regard regardfulness remark resolution respect seriousness sincerity single-mindedness spirit studiousness study submersion thought vehemence warmth zeal