jQuery Uncaught TypeError: Property ‘$’ of object [object Window] is not a function

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This is a syntax issue, the jQuery library included with WordPress loads in “no conflict” mode. This is to prevent compatibility problems with other javascript libraries that WordPress can load. In “no-confict” mode, the $ shortcut is not available and the longer jQuery is used, i.e.

jQuery(document).ready(function ($) {

By including the $ in parenthesis after the function call you can then use this shortcut within the code block.

For full details see WordPress Codex

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