Kairos is a noun that refers to a propitious moment for a decision or action. 

Our word of the day comes directly from the Greek word that means ‘opportunity.’ It’s been around since the 1930s. Here’s an example of kairos in use:

When the mayor faced a kairos in his first term, the result was a catastrophic failure to act. If the same happens in his second term, he may not get a second opportunity to prove he can make a key decision.