In an advisory manner; with the purpose or character of offering advice or counsel.
From advisory (advise plus -ory) plus the adverb suffix -ly. This is a rare formation expressing how something is done in an advisory capacity.
When someone says something 'advisorily,' they're signaling they're offering guidance, not orders—it's a way to soften what you're saying by emphasizing that the other person can choose to ignore you.
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