February 12, 2011 
Definition:
function term_description( $term = 0, $taxonomy = 'post_tag' ) {}
Retrieve term description.
Parameters
- int $term: Optional. Term ID. Will use global term ID by default.
- $taxonomy
Return values
returns:Term description, available.
Source code
function term_description( $term = 0, $taxonomy = 'post_tag' ) {
if ( !$term && ( is_tax() || is_tag() || is_category() ) ) {
$term = get_queried_object();
$taxonomy = $term->taxonomy;
$term = $term->term_id;
}
$description = get_term_field( 'description', $term, $taxonomy );
return is_wp_error( $description ) ? '' : $description;
}
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A HitchHackers guide through WordPress 
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