Relating to, characterized by, or serving the purpose of giving advice or counsel.
From advise plus the adjective suffix -ive (as in 'creative' or 'decisive'). This is a rare or archaic formation, largely replaced by 'advisory' in modern English.
This word almost never appears in modern usage because 'advisory' works better and sounds more natural—'advisive' is a linguistic ghost, a word that could exist according to English rules but nobody actually uses.
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