# Newtonian

> English word · Adjective · IPA /njuːˈtəʊ.ni.ən/ · frequency rank #41,278

## Definitions
1. Of or relating to Isaac Newton, or his laws and theories.
2. Obeying Newton's law of viscosity; i.e. having a constant viscosity.
3. Of or relating to classical physics that does not take relativity into account.
4. Being or relating to a type of reflecting telescope using a concave primary mirror and a flat diagonal secondary mirror.

## Etymology
From Newton + -ian.

## Common misspellings (13)
`enwtonian`, `netwonian`, `newotnian`, `newtnoian`, `newtoinan`, `newtonain`, `newtoniann`, `newtonina`, `newtonnian`, `newttonian`, `newwtonian`, `nnewtonian`, `nwetonian`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/newtonian