Implements hook_entity_view().
function taxonomy_test_entity_view($entity, $view_mode, $langcode) {
if ($entity
->entityType() == 'taxonomy_term' && $view_mode == 'full') {
$entity->content['taxonomy_test_entity_view_check'] = array(
'#prefix' => '<div>',
'#markup' => t('The antonym is %antonym', array(
'%antonym' => $entity->antonym,
)),
'#suffix' => '</div>',
'#weight' => 20,
);
}
}