Perhaps someone recently edited a core file or a plugin, which has now caused a conflict.
There’s an error or typo in your version of jQuery. If you’re not using a CDN at all, you can rule out this possibility entirely. The CDN that you’re using to improve your site performance was unable to reach your server. Or perhaps a JavaScript file is not being correctly loaded when the page loads. 
The JavaScript on your website is running before the jQuery is fully loaded. 
Double-check your server resources or error log to confirm this.
A slow or poor-performing hosting environment could increase the amount of time it takes your jQuery to perform when called. 
If you recently installed or activated new plugins or some of the plugins on your site have not been updated recently, this may be the cause.
Old plugins installed on your WordPress site are conflicting with ones that you installed and activated more recently. There are a few possible things that could have occurred that threw the “jQuery is not defined” error: Your site was working just fine yesterday - what happened? This might be a bit of a head-scratcher. 😫 Learn how to fix it here! ⬇️ Click to Tweet Potential Causes of the “jQuery Is Not Defined” Error Whether you’re a stranger to WordPress errors or not, being met with “jQuery is not defined” while working on your website is never fun. jQuery is not defined” error in the console log. Because roughly 78% of the websites on the internet run on jQuery, this is a common error to find. This error can potentially shut down your site to visitors. For some reason, when the browser tried to load the website and called for that specific jQuery, it was not available. 
In plain English, this error is trying to tell you that something on your site - may be a plugin - requires jQuery to function on your site. The support is rapid and outstanding, and their servers are the fastest for WordPress. Kinsta is amazing, I use it for my personal website.
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