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Adverb: as needed
  1. According to need (physicians use PRN in writing prescriptions)
    "add water as needed";
    - as required, pro re nata, PRN

Nearest

as and when
as far as possible
as follows
as for
as if
as if by magic
as it is
as it were
as luck would have it
as much as possible
as needed
as of
as of late
as regards
as required
as such
as the crow flies
as though
as to
as usual
as we say