- fastness, fixedness, fixity, fixture, secureness - the quality of being fixed in place
--1 is a kind of immovability, immovableness
--1 has particulars: lodgment, lodgement, lodging - immutability, immutableness, fixity - the quality of being incapable of mutation; "Darwin challenged the fixity of species"
--2 is a kind of changelessness, unchangeability, unchangeableness, unchangingness
--2 has particulars: unalterability; agelessness