Parent
WP_Term Object
(
    [term_id] => 21
    [name] => Undergraduate
    [slug] => undergraduate
    [term_group] => 0
    [term_taxonomy_id] => 21
    [taxonomy] => cos_course_tax
    [description] => 
    [parent] => 0
    [count] => 58
    [filter] => raw
)