What does academic suffix IM mean?

The suffix "-im" is not typically used as an academic suffix. It might appear in some words, but it wouldn't have a specific academic meaning.

It's likely you are thinking of a different suffix, perhaps:

* -ism: This suffix is used to form nouns denoting a doctrine, system, theory, or practice, often associated with a particular person or group. Examples: "capitalism," "communism," "Buddhism."

* -ist: This suffix is used to form nouns denoting a person who adheres to or practices a particular doctrine, system, theory, or practice. Examples: "capitalist," "communist," "Buddhist."

* -ic: This suffix is used to form adjectives relating to a particular subject, place, or person. Examples: "historic," "scientific," "geometric."

Please clarify what word you are referring to with the suffix "-im," and I can help you understand its meaning.