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addition Line breaks: add|ition
Pronunciation: /əˈdɪʃ(ə)n/

Definition of addition in English:


[mass noun]
1The action or process of adding something to something else: the hotel has been extended with the addition of more rooms
More example sentences
  • A wakeboard is similar in shape to a snowboard, with the addition of two small fins on the underside.
  • With the addition of a few commas and the striking out of the one paragraph, the deal already on the table will finally go through.
  • The colour range favours warm and tropical colours, with the addition of blue and sea green.
1.1 [count noun] A person or thing added or joined: you will find the coat a useful addition to your wardrobe
More example sentences
  • With many riders returning, there are also many new promising additions to the club.
  • The intention is to add more tours to the database each year so that visitors will be able to return and catch up on the latest additions.
  • The new design was intended to create more internal space, which meant stripping away the additions at the back.
2The process of calculating the total of two or more numbers or amounts: she began with simple arithmetic, addition and then subtraction
More example sentences
  • That is addition, multiplication and the two inverse operations of subtraction and division.
  • Yet addition and also subtraction are only an extension of counting.
  • The Count Hoot section of the site helps with addition and subtraction as well.
2.1 Mathematics The process of combining matrices, vectors, or other quantities under specific rules to obtain their sum or resultant: [with modifier]: the concepts of vectors and vector addition
More example sentences
  • This suggests that Component 3 is not a vector addition but could be a single component.
  • Superimposing the two logical operations we can define binary addition.
  • We were reviewing vector addition this evening at a study session.


Late Middle English: from Latin additio(n-), from the verb addere (see add).


in addition

As an extra person or thing: members of the board were paid a small allowance in addition to their normal salary
More example sentences
  • Some employers also offer extra time off and more money for fathers in addition to SPP.
  • This is in addition to the usual information, such as the location of property lines and buildings.
  • There was fun and games and treats and these were in addition to a much enjoyed bouncy castle.

Words that rhyme with addition

academician, aesthetician (US esthetician), ambition, audition, beautician, clinician, coition, cosmetician, diagnostician, dialectician, dietitian, Domitian, edition, electrician, emission, fission, fruition, Hermitian, ignition, linguistician, logician, magician, mathematician, Mauritian, mechanician, metaphysician, mission, monition, mortician, munition, musician, obstetrician, omission, optician, paediatrician (US pediatrician), patrician, petition, Phoenician, physician, politician, position, rhetorician, sedition, statistician, suspicion, tactician, technician, theoretician, Titian, tuition, volition

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Word of the day fortissimo
Pronunciation: fɔːˈtɪsɪməʊ
(especially as a direction) very loud or loudly