The difference between Boreal and Septentrional
When used as adjectives, boreal means of, relating to, or coming from the north, whereas septentrional means pertaining to the north.
check bellow for the other definitions of Boreal and Septentrional
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Boreal as an adjective:
Of, relating to, or coming from the north.
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Septentrional as an adjective (rare, literary):
Pertaining to the north; northern.