To apply oneself with diligence and careful attention; to work steadily and devotedly at something.
From Latin assiduus + -ate verb suffix. This verb form transforms the adjective describing diligence into an action—the verb meaning to act diligently.
Assiduate is rare in modern English, but it appeared in older texts to mean 'to sit down and work'—it's a verb for dedication itself, not just its description.
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