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<?php
add_filter( 'woocommerce_product_tabs', 'woo_rename_tabs', 98 );
function woo_rename_tabs( $tabs ) {

	//$tabs['description']['title'] = __( 'More Information' );		// Rename the description tab
	//$tabs['reviews']['title'] = __( 'Ratings' );				// Rename the reviews tab
	$tabs['additional_information']['title'] = __( 'Specifications' );	// Rename the additional information tab

	return $tabs;

}