This is the 1985th most frequent Japanese word.
らい
"らい" (rai) can mean "next" or "coming," often used in contexts like "next week" (来週, raishū).
Here, 'らい' is part of '来週' (raishuu), meaning 'next week', indicating time.
来週は忙しいです。
Next week is busy.
In this sentence, 'らい' appears in '来られる' (korareru), which is a potential form of '来る' (kuru, to come), showing possibility.
本を借りたい場合、図書館に来られます。
If you want to borrow the book, you can come to the library.
'らい' is part of '未来' (mirai), meaning 'future', referring to time to come.