term_description( int $term, null $deprecated = null )

Retrieve term description.

Parameters

$term

(Optional) Term ID. Will use global term ID by default.

$deprecated

(Optional) Deprecated argument.

Default value: null

Return

(string) Term description, available.

Source

File: wp-includes/category-template.php 

function term_description( $term = 0, $deprecated = null ) {
	if ( ! $term && ( is_tax() || is_tag() || is_category() ) ) {
		$term = get_queried_object();
		if ( $term ) {
			$term = $term->term_id;
		}
	}
	$description = get_term_field( 'description', $term );
	return is_wp_error( $description ) ? '' : $description;
}

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Related

Uses

Uses
Uses Description
wp-includes/query.php: is_tax()

Is the query for an existing custom taxonomy archive page?
wp-includes/query.php: is_tag()

Is the query for an existing tag archive page?
wp-includes/query.php: is_category()

Is the query for an existing category archive page?
wp-includes/query.php: get_queried_object()

Retrieve the currently-queried object.
wp-includes/load.php: is_wp_error()

Check whether variable is a ClassicPress Error.
wp-includes/taxonomy.php: get_term_field()

Get sanitized Term field.
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Changelog

Changelog
Version Description
WP-4.9.2 The $taxonomy parameter was deprecated.
WP-2.8.0 Introduced.