In a dependent manner; while relying on or subordinate to something else.
From dependent (adjective, from Latin dependens, present participle of dependere) plus -ly (adverbial suffix). This represents the standard English pattern of converting adjectives to adverbs.
In psychology and development studies, children are described as growing 'dependently' (relying on parents) before becoming independent—the word captures the full developmental arc that humans experience from birth.
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