This is the 3124th most frequent Chinese word.
一季度
"First quarter" (of a year).
Here, "一季度" specifies the time period of 'the first quarter' for which the report is applicable.
一季度的财务报告已经提交审核。
The financial report for the first quarter has been submitted for review.
Here, "一季度" refers to the time frame during which the observed growth occurred.
在一季度，我们的销售额增长了15%。
In the first quarter, our sales increased by 15%.
In this sentence, "一季度" is used to indicate the deadline or time range in which the planned activity is to be accomplished.