In an extremely large amount; to a very great degree; vastly.
From 'immense' (from Latin 'immensus' meaning 'unmeasured' or 'boundless,' from 'in-' + 'mensus' meaning 'measured'), plus the adverbial suffix '-ly.' The word entered English around the 1500s and grew popular with Romantic poets who loved describing vast, overwhelming emotions and landscapes.
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