large company; major corporation
General term for a big business; used in everyday contexts.
彼は大会社に就職した。
He got a job at a large company.
large company (legal definition)
Legal term under Japanese corporate law: a company with capital over 500 million yen or liabilities over 20 billion yen.
大会社には厳しい会計監査が義務付けられている。
Large companies are required to undergo strict accounting audits.
大会社 simply means 'big company' and is less common than 大企業, which is the standard term used in business and economic contexts.
Compound of 大 (だい, 'large') + 会社 (かいしゃ, 'company').