Meaning of INVARIANT in English

INVARIANT

I. “+ noun

Etymology: in- (I) + variant

: a constant factor : one that does not change ; specifically : a mathematical expression or magnitude that remains unchanged under prescribed or implied conditions

II. adjective

Etymology: in- (I) + variant

1. : constant , unchanging , unvarying , universal

16 subjects were presented, on 4 successive days, with 300 invariant stimuli — Biological Abstracts

basic human emotions … are invariant — H.B.Parkes

specifically : unaffected by the group of mathematical operations under consideration

2. : having no degree of freedom — used of a physical-chemical system; compare phase rule

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.