In a manner relating to or based on the casting or interpretation of astrological birth charts.
Genethliacal + -ly adverbial suffix. This adverb form allows genethliac concepts to be applied as modifiers to actions or states, common in technical astrological writing.
You could say someone was 'genethliacally destined' to meet someone—it's how medieval astrologers described cosmic coincidences that modern people might call 'meant to be.'
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