patriarchal vs patriarchial

patriarchal

adj
  • Characteristic of a patriarch; venerable. 

  • Relating to a system run by males, rather than females; relating to a patriarchy. 

patriarchial

adj
  • Characteristic of or pertaining to a patriarchy. 

How often have the words patriarchal and patriarchial occurred in a corpus of books? (source: Google Ngram Viewer )