I do not know who invented this word, but I can tell you that it is not in the KJV Bible. Neither is 'reunite' in The Bible; though the word 'unite' appears six times, and 'union' appears three times.
The word reunion is spelled as one word, not hyphenated.
The Romanian word equivalent for reunion is reuniune.
greek word - alumni & reunion
Reunion
The word reunion is a noun. The plural noun is reunions.
I am going to my family reunion.
The root word would be "union". Reunion means to unite again or bring into union again. There has to be a previous "union" in order for there to be a reunion.
Reunion is typically considered a compound word, as it is formed by combining the words "re" and "union."
re un ion - three syllables?
The word 'reunion' does not exist in the King James version of the Bible.
No, it is not. Reunion is a noun (e.g. class reunion). However, it is a noun adjunct in terms such as reunion dance.