Why the process of recombination is called re combination?

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micomaco86572
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Why the process of recombination is called "re"combination?

The process in which the nucleus and electrons combined to form neutral atoms at early times is called recombination. But why it is added an "re" to "combination"? Is there any combination process before this process?
Thx!
 
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Recombination is defined as when the universe cooled sufficient to permit electrically neutral hydrogen atoms to form.