noun
a state or condition of being preoccupied or engrossed with something
adjective
preoccupied or engrossed with something
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Her preoccupation with detail often resulted in meticulous work.
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His preoccupation with video games kept him up all night.
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She's got a preoccupation with social media that's off the charts.
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His preoccupation with the past was like carrying a heavy burden wherever he went.