entrenchment
noun
[ ɪnˈtrɛn(t)ʃm(ə)nt ]
• the process or fact of an attitude, habit, or belief becoming so firmly established that change is very difficult or unlikely.
• "this book demonstrates the entrenchment of certain views and paradigms in financial history"
• a trench or system of trenches dug by troops to provide a place of shelter from enemy fire.
• "the English dug entrenchments and moved forward"
