The present participle of acquaint; the act of making someone familiar with or introducing someone to something.
From acquaint (Old French acointier, from Latin ad + cognitus 'known') with the present participle suffix -ing. The -ing suffix creates the continuous form of verbs, indicating an ongoing action or process.
When you're 'acquainting' yourself with something—like learning a new software program—you're in that stage between completely unfamiliar and fully knowledgeable, which is how most learning actually happens!
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