"engrossment" in the noun sense
1. concentration, engrossment, absorption, immersion
complete attention intense mental effort
2. preoccupation, preoccupancy, absorption, engrossment
the mental state of being preoccupied by something
3. intentness, engrossment
the quality of being intent and concentrated
"the intentness of his gaze"
Source: WordNet® (An amazing lexical database of English)
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