To save this word, you'll need to log in.

## Definition of *cubic equation*

**:**a polynomial equation in which the highest sum of exponents of variables in any term is three

Keep scrolling for more

#### Test Your Vocabulary

July 2020 Words of the Day Quiz

- Which is a synonym of
**mien**?

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ**Test Your Knowledge** - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Merriam-Webster unabridgedWords at Play

Ask the Editors

Word Games

Share

cubic equationTime Traveler for

cubic equation## The first known use of

cubic equationwas circa 1751See more words from the same year