The speed of light in a vacuum is an invariable in physics.
invariableadverb
In a way that never changes.
The sun invariably rises in the east.
She invariably arrived late, much to the annoyance of her colleagues.
Frequently Asked Questions
The phonetic transcription of "invariable" is /ɪnˈveəriəbl/ in British English and /ɪnˈveriəbl/ in American English. Click the 🔊 button to hear both pronunciations.
Synonyms for "invariable": consistent, fixed, constant, immutable, unvarying.
Example usage of "invariable": "Her routine was invariable, always the same every day.". More examples on the page.