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  • add
    add
    verb (used with object)
    to unite or join so as to increase the number, quantity, size, or importance.
  • ADD
    ADD
    abbreviation
    attention deficit disorder: the inattentive subtype of ADHD, usually marked by distractibility and difficulties with executive function.
Synonyms

add

1 American  
[ad] / æd /

verb (used with object)

  1. to unite or join so as to increase the number, quantity, size, or importance.

    to add two cups of sugar; to add a postscript to her letter;

    to add insult to injury.

    Synonyms:
    adjoin, attach, append, affix
  2. to find the sum of (often followed byup ).

    Add this column of figures.

    Add up the grocery bills.

    Synonyms:
    sum, total
  3. to say or write further.

  4. to include (usually followed byin ).

    Don't forget to add in the tip.


verb (used without object)

  1. to perform the arithmetic operation of addition.

    children learning to add and subtract.

  2. to be or serve as an addition (usually followed byto ).

    His illness added to the family's troubles.

noun

  1. Journalism. copy added to a completed story.

verb phrase

  1. add up to to signify; indicate.

    The evidence adds up to a case of murder.

idioms

  1. add up,

    1. to make the desired, expected, or correct total.

      These figures don't add up right.

    2. to seem reasonable or consistent; be in harmony or accord.

      Some aspects of the story didn't add up.

ADD 2 American  
[ey-dee-dee] / ˈeɪˈdiˈdi /

abbreviation

  1. attention deficit disorder: the inattentive subtype of ADHD, usually marked by distractibility and difficulties with executive function.


ADD 1 British  

abbreviation

  1. attention deficit disorder

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

add 2 British  
/ æd /

verb

  1. to combine (two or more numbers or quantities) by addition

  2. to increase (a number or quantity) by another number or quantity using addition

  3. to join (something) to something else in order to increase the size, quantity, effect, or scope; unite (with)

    to add insult to injury

  4. to have an extra and increased effect (on)

    her illness added to his worries

  5. (tr) to say or write further

  6. to include

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. informal an instance of adding someone to one's list of contacts on a social networking site, esp MySpace

    Thanks for the add!

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
ADD Scientific  
  1. Abbreviation of attention deficit disorder


Other Word Forms

Etymology

Origin of add1

First recorded in 1325–75; Middle English adden, from Latin addere, equivalent to ad- ad- + -dere “to put” (combining form; see do 1)

Origin of ADD2

First recorded in 1975–80

Explanation

When you add, you join two or more things together. If you add on to your summer cottage, you build an extra room that's connected to your existing house. If your boss adds ten dollars to your paycheck, she gives you the money in addition to, or on top of, your salary. And when you add a column of numbers, you combine each one in the list until you get a final answer. You might verbally add something by making one last statement: "I'd like to add that I can't wait to visit again!" The Latin root is addere, "add to, join, or attach."

Keep Reading on Vocabulary.com

Vocabulary lists containing add

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

While Burger King may occasionally add some “pizzazz” to its menu items to make the movie meals appear more “interesting and Instagrammable,” the company’s priority is to serve “great-tasting food,” he said.

From Los Angeles Times • May 22, 2026

Then parents should do the math to determine how much their child’s return will add to their household expenditures.

From MarketWatch • May 21, 2026

Arsenal have the chance to add a second trophy this season when they take on Paris St-Germain in the Champions League final on Sunday, 30 May in Budapest.

From BBC • May 21, 2026

A shortened timeline brings the potential for “forced buying” from top index providers, which could add tens of billions of dollars in demand for SpaceX, points out Joel Shulman, CEO of ERShares.

From Barron's • May 21, 2026

To add a dog to a team anywhere on the trail was against the rules.

From "Black Star, Bright Dawn" by Scott O'Dell

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