When I was looking for a word in my dictionary, I found this sentence  : 会开完了。which (in the dictionary) translated as "The meeting is over". I wonder what 开 means here... because when the sentence is translated word per word, 开 doesn't seem to have anything to do with the whole sentence.

Does 开 serve as something else (like grammatical expression or particle) here?

Will it be alright if I say  : 会完了。?

When I was looking for a word in my dictionary, I found this sentence: 会开完了, which (in the dictionary) is translated as "the meeting is over". 

I wonder what 开 means here... because when the sentence is translated word per word, 开 doesn't seem to have anything to do with the whole sentence.

Does 开 serve as something else (like grammatical expression or particle) here?

Will it be alright if I say: 会完了?