fixity

noun

1. (uncountable)The state or condition of being fixed; Fixation.

   “[O]therwise, it is almost inescapable that there must be some sort of centralized mechanism guaranteeing the fixity of prices[.]”

2. (countable)Something fixed.
3. (countable, uncountable)The position of an operator relative to its operand (prefix, postfix) or operands (infix).

   “One may use a fixity declaration in Haskell to describe an operator's precedence and direction of associativity.”