noun
constant or close attention to what one is doing; diligence
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The success of the project was largely due to the team's assiduity in meeting deadlines and delivering high-quality work.
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Her assiduity in studying paid off when she aced the exam.
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I can't believe his assiduity in playing video games all day long.
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The artist's assiduity in perfecting his craft is evident in every stroke of his brush.