Relating to or having the purpose of offering advice or guidance; of the nature of counsel or recommendation.
From advise plus the adjective-forming suffix -atory (as in 'explanatory' or 'exploratory'). The word describes something designed to give advice or function in an advisory capacity.
An 'advisatory' body or committee has the job of giving recommendations but usually can't make decisions themselves—they're the people in the room who offer wisdom but others have the final say.
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