Broadly used as in English: commercial activity, work, or a specific enterprise. Common in compounds like ビジネスマン (businessman) and ビジネスモデル (business model).
彼は新しいビジネスを始めた。
He started a new business.
ビジネスの世界は厳しい。
The business world is tough.
He started a new business after retiring.
This company runs its business across various Asian countries.
We do business with a Chinese company.
I'm going to New York on business next week.
business district
side business; side job
business traveller; business passenger
business book
business magazine
eco-business; environmental business
core business
business terminology; business jargon
business English
concession-based business; company holding a concession; concessionaire