To burn brightly or flame; to blaze or shine with intense light (archaic or rare usage).
From Latin 'flagrare' (to burn or blaze), from Indo-European root '*bhleg-' (to shine or burn). The word appears rarely in English, mostly in historical or technical contexts related to burning.
The Latin root 'flagrare' is the same root that connects 'flagrant,' 'flagrance,' and even 'conflagration' (a massive fire), so all these words literally trace back to the concept of burning or shining brightly!
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