In a magnificent, impressive, or brilliant way; with great beauty or excellence.
From 'splendid' (Latin 'splendidus,' meaning 'shining' or 'bright') plus the adverbial suffix '-ly.' The root 'splend-' relates to brightness and shining.
The root of 'splendid' comes from Latin 'splendere' (to shine), which is why it literally means to be bright and impressive—and it's related to 'splinter,' showing how the idea of shining evolved from something being bright enough to sparkle like fragments of light!
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