invariant

名词 invariant:

1. a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it

形容词 invariant:

1. unaffected by a designated operation or transformation
2. persistent in occurrence and unvarying in nature
   同义词：changeless, constant, unvarying

in.var.i.ant

adj.（形容词）
Not varying; constant.
不变的：不变的；始终如一的
Mathematics Unaffected by a designated operation, as a transformation of coordinates.
【数学】 恒定的：不受指定运算，例如坐标的变换影响的
n.（名词）
An invariant quantity, function, configuration, or system.
不变量：不变的数量、作用、布局或系统

【引伸】
invar.iance
n.（名词）