Competent or skilled in doing or using something; having considerable ability, expertise, or experience in a particular area.
From Latin 'proficiens', present participle of 'proficere' (to make progress, accomplish), from 'pro-' (forward) and 'facere' (to make, do). The word entered English in the 16th century, emphasizing advancement and accomplishment in skills.
Being 'proficient' literally means 'making forward progress' - it's not about perfection but about demonstrable advancement, reminding us that expertise is a journey of continuous improvement rather than a fixed destination.
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