in ‧ var ‧ i ‧ a ‧ ble AC /ɪnˈveəriəb ə l $ -ˈver-/ BrE AmE adjective
[ Word Family: noun : ↑ variable , ↑ variance , ↑ variant , ↑ variety , ↑ variability , ↑ variation ; adjective : ↑ variable ≠ ↑ invariable , ↑ varied , ↑ various ; adverb : ↑ variably ≠ ↑ invariably , ↑ variously ; verb : ↑ vary ]
1 . always happening in the same way, at the same time etc:
His invariable answer was ‘Wait and see.’
2 . technical never changing OPP variable :
Mass, unlike weight, is invariable.