This is the 1702nd most frequent Japanese word.
きょう
"きょう" means "today."
Here, 'きょう' again means 'today' and specifies when the event is occurring.
学校では、きょう、イベントがあります。
At school, there's an event today.
The word 'きょう' means 'today' in this sentence and is used as a time indicator to specify the current day.
今日は晴れています。
Today is sunny.
In this sentence, 'きょう' indicates possession related to 'topic', signifying 'today's topic'.