Etymology
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advisory (adj.)

1778, "having the power to advise;" see advise + -ory. The noun meaning "weather warning" is from 1936, used by U.S. agencies, probably short for advisory bulletin.

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Definitions of advisory
1
advisory (n.)
an announcement that usually advises or warns the public of some threat;
a frost advisory
2
advisory (adj.)
giving advice;
an advisory memorandum
Synonyms: consultative / consultatory / consultive
From wordnet.princeton.edu