Is "as" a conjunction and what does it mean here?
Traditional grammar treats this use of "as" as a subordinating conjunction when it introduce clauses, and a preposition when it introduces noun phrases. Modern grammar treats this "as" as a preposition irrespective of the complementation. ".
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Traditional grammar treats this use of "as" as a subordinating conjunction when it introduce clauses, and a preposition when it introduces noun phrases.
Modern grammar treats this "as" as a preposition irrespective of the complementation.
It has a temporal meaning, roughly equivalent to "whilst ...". See here