Walt thought I was crazy. In 20 months, he had gone from being head of a small $7.5 million (sales) medical development business to manager of the chemical and metallurgical division, one of GE’s biggest and most profitable businesses, with $500 million in sales.
Hi, there. The sentences above are an excerpt from the book Jack: Straight from the Gut by Jack Welch. I have looked up the meaning of "business" in several dictionaries. It seems that "business" is a countable noun only when it means "company". Longman Dictionary
But from the excerpt, "businesses" here doesn't mean "companies", which makes me really confused. Besides, does these two "business" in the excerpt mean the same?