In a manner relating to, positioned at, or proceeding from a base or foundation.
From 'basal' (adjective meaning 'of or at the base') plus the adverbial suffix '-ly.' 'Basal' itself comes from Latin 'basalis,' derived from 'basis.'
In biology, 'basally' describes evolutionary relationships—when you say a creature is 'basally positioned,' you mean it branched off earlier in the family tree, closer to the common ancestor at the base.
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