Business and Finance: This is the most common context. Companies issue `季度报告` (jìdù bàogào, quarterly reports), managers set `季度目标` (jìdù mùbiāo, quarterly goals), and employees might receive a `季度奖金` (jìdù jiǎngjīn, quarterly bonus). It's the standard unit for measuring short-to-medium term business performance.
Government and Economics: Government agencies release economic data, such as GDP growth, on a quarterly basis. You'll often hear news reports discussing `第一季度` (dì yī jìdù, first quarter) economic statistics.
Planning and Scheduling: In project management, tasks and deadlines are often organized by `季度`.
Formality: `季度` is a neutral to formal term. It belongs in the office, in reports, and in the news. You would not use it in a casual conversation about your personal life. For instance, you wouldn't say “I'm going to visit my parents next `季度`.” You would say `下个月` (xià ge yuè, next month) or `夏天` (xiàtiān, summer).