in a way that continues forever or all the time; constantly and endlessly.
From Latin 'perpetualis,' meaning 'continuous' or 'everlasting,' derived from 'perpetuus' (per- meaning 'through' + petere meaning 'to seek'). The adverb form emerged in Middle English.
A 'perpetual motion machine' is something physicists love to dream about but physics says is impossible—you'd need infinite energy and zero friction, which can't exist in reality. Yet we use this word constantly to describe YouTube recommendations!
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