With Pathauto, we could configure the node path alias in a much convenient way. Sometimes, we may want to get those alias in code during Drupal development. The following function will return the path alias from a nid.

drupal_lookup_path('alias', "node/".$node->nid);

The above method should also work for term path.

Done =)

Reference: daipratt.co.uk – How to get the path of a node from the node ID in Drupal