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Partially is used when you talk about a condition or state. Partly is a part distinct from a whole such as a physical object
Yes, it is an adverb. It means partially, in part but not entirely.
No, it is not an adverb. Part is a noun, or a verb. There are adverb forms for in part (partly) and the adjective partial (partially).
Yes, it is. It usually means partly or incompletely.
The correct spelling of the adverb is "partially" (partly, somewhat).