This is the 6996th most frequent Dutch word.
alleemaal
The correct spelling is "allemaal," and it means "everyone" or "all."
Here, 'allemaal' emphasizes that the thankfulness is directed at each and every person in the group addressed.
Ik wil jullie allemaal bedanken voor jullie hulp.
I want to thank you all for your help.
In this sentence, 'allemaal' generalizes and refers to the entire group.
Allemaal hebben ze hun eigen taken voltooid.
All of them have completed their own tasks.
In this context, 'allemaal' is used to generalize and indicate the entirety of the subject being discussed.