Society, Age, Generation
Noun
よ
このアプリは、まだ世に出ていません。
This app still isn’t world famous.
まったく世も末だね。
The world really is coming to an end.
暗殺者は別にして、スズメ蜂ほど怖いものはこの世の中にない。
Other than assassins, nothing in this world is scarier than wasps.
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it uses the kun'yomi reading. Here's a mnemonic to help you to remember it:
Since you have generations of people making up this world, think of the rapper generation. What do they say all the time (obviously I don't know anything about rap)? They say "Yo yo yo!" (よ).