organiseerivate
Organiseerivate is a term that appears to be a misspelling or a non-standard word in common usage. It is likely a phonetic or grammatical variation of the Dutch word "organiseer" which means "to organize" or "to arrange". The ending "-vate" does not form a standard grammatical suffix in Dutch or English that would modify the root word in a recognizable way.
If the intended word was "organizer" (English), it refers to a person or thing that organizes something,
Another possibility is that "organiseerivate" is a neologism or a very specific technical term within a niche