Adjective monthly has 1 sense
  1. monthly - occurring or payable every month; "monthly payments"; "the monthly newsletter"
,Adverbial monthly has 1 sense
  1. monthly, every month, each month - without missing a month; "we get paid monthly"
,Noun monthly has 1 sense
  1. monthly - a periodical that is published every month
    --1 is a kind of
    series, serial, serial publication
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