over (a period); concerning; regarding~
Indicates a span of time over which something happens, or a topic/field being discussed.
This particle has two main uses. First, it marks a time span during which something occurs or develops, often implying a gradual change or process. For example, 春にかけて means 'over the spring' or 'throughout spring'. It can also be used with specific dates or periods. Second, it can mean 'regarding' or 'concerning' a particular topic, similar to について, but it is more formal and often used in written or academic contexts. In this usage, it typically appears as ~にかけての + noun.