addition rule

noun

Definition of addition rule

: a rule in statistics: the probability of any one of a set of mutually exclusive events occurring is the sum of the probabilities of the individual events

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of addition rule

1889, in the meaning defined above

Keep scrolling for more

Learn More About addition rule

Time Traveler for addition rule

Time Traveler

The first known use of addition rule was in 1889

See more words from the same year

Dictionary Entries Near addition rule

addition reaction

addition rule

addition theorem

See More Nearby Entries 

Statistics for addition rule

Cite this Entry

“Addition rule.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/addition%20rule. Accessed 27 Jul. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

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