FIXITY
Meaning of FIXITY in English
fix ‧ i ‧ ty /ˈfɪksəti, ˈfɪksɪti/ BrE AmE noun [uncountable] formal
when something does not change
fixity of
fixity of purpose
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012