noun
in the black; surplus
Used in accounting and business to describe a positive balance or profit. Antonym: 赤字 (in the red).
Antonyms: 赤字
今年度の決算は黒字だった。
This fiscal year's financial results were in the black.
経費
We finally turned a profit by cutting costs.
noun
black letter
Rare, domain-specific use referring to black lettering or text, as opposed to red or other colors. Not common in everyday conversation.
この書類では、重要な項目は黒字で印刷されている。
In this document, important items are printed in black letters.