supplement

[suhp-luh-muhnt, suhp-luh-ment]

noun

1. something added to complete a thing, supply a deficiency, or reinforce or extend a whole.

2. a part added to a book, document, etc., to supply additional or later information, correct errors, or the like.

   Synonyms: postscript, epilogue, addendum

3. a part, usually of special character, issued as an additional feature of a newspaper or other periodical.

4. Geometry.,  the quantity by which an angle or an arc falls short of 180° or a semicircle.

verb (used with object)

1. to complete, add to, or extend by a supplement.

2. to form a supplement or addition to.

3. to supply (a deficiency).

supplement

noun

1. an addition designed to complete, make up for a deficiency, etc

2. a section appended to a publication to supply further information, correct errors, etc

3. a magazine or section inserted into a newspaper or periodical, such as one with colour photographs issued every week

4. geometry

   1. either of a pair of angles whose sum is 180°

   2. Abbreviation: sup.  supp. an arc of a circle that when added to another arc forms a semicircle

verb

1. (tr) to provide a supplement to, esp in order to remedy a deficiency

Other Word Forms

• supplementer noun
• unsupplemented adjective
• well-supplemented adjective
• supplementation noun

Word History and Origins

Origin of supplement¹

First recorded in 1350–1400; Middle English, from Latin supplēmentum “that by which anything is made full,” equivalent to sup- sup- + plē- (stem of plēre “to fill”; full ¹ ) + -mentum -ment

Word History and Origins

Origin of supplement¹

C14: from Latin supplēmentum, from supplēre to _supply ¹

Synonym Study

See appendix. See complement.

Example Sentences

The researchers plan to further intensify the observations of dust devils and supplement the data obtained with targeted and coordinated observations of dust devils using CaSSIS and HRSC.

Read more on Science Daily

The new tax law doesn’t affect the supplement to the standard deduction, said Andy Phillips, vice president of H&R Block’s Tax Institute.

Read more on MarketWatch

I believe that investors will pay considerably less for financial advisory services, and will use them a la carte to supplement AI investment strategies, rather than paying a straight percentage fee for assets under management.

Read more on Wall Street Journal

More runners in the middle distances are using a supplement whose main ingredient is sodium bicarbonate—household baking soda.

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Pregnant women typically take folate supplements to prevent neural tube defects in developing fetuses.

Read more on Wall Street Journal

Related Words

• augment 
• build up 
• buttress 
• complement 
• enhance 
• enrich 
• fill out 
• fortify 
• improve 
• reinforce 
• strengthen 
• subsidize 

When To Use

What does supplement mean?

A supplement is an addition to something that completes it or makes up for a shortcoming, as in He takes vitamin supplements to make up for his vitamin C deficiency.A supplement is also an addition to a book that provides important information or corrects errors. In this sense, supplement can be confused with the words appendix and index. An appendix gives additional information, such as charts and graphs, but the book or document would be considered complete without it. An index is an alphabetical list of names or topics with page numbers that helps you find something specific in the book, such as all the references to John Wilkes Booth in a biography of Abraham Lincoln.As a verb, supplement means to add to something, as in Tameka sold paintings to supplement her income.In this sense, supplement can be confused with the word complement. Both words mean to add something, but to complement means to add something to make up for a missing piece or element, while to supplement is to add extra information.Example: The company built a new roller coaster to supplement its original roller coaster, which always has a long line.