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define('WP_POST_REVISIONS', false );
// Disable post revision on a custom post type:
// When registering the post type be shure to remove it from supports array:
$args = array(
'label' => 'CPT Label',
'supports' => array( 'title', 'editor', 'revisions' ),
{...}
);
register_post_type( 'CPT', $args );