: a nucleotide C10H15N5O10P2 composed of adenosine and two phosphate groups that is formed in living cells as an intermediate between ATP and AMP and that is reversibly converted to ATP for the storing of energy by the addition of a high-energy phosphate group

called also adenosine diphosphate

Examples of ADP in a Sentence

Recent Examples on the Web
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The gap between pay increases for workers staying and leaving jobs fell below 2 percentage points last month, according to the ADP. Alex Harring, CNBC, 20 Feb. 2026 Projection systems currently slot Lowe around the 69th-best outfielder, while his ADP is about 63rd, indicating mild market optimism. Derek Vanriper, New York Times, 19 Feb. 2026 Some hints could be seen in ADP’s private payroll data report released earlier this month, which showed just 22,000 roles were added in January. Eleanor Pringle, Fortune, 11 Feb. 2026 On Wednesday, payroll processor ADP reported that private employers added just 22,000 jobs last month, far fewer than forecasters had expected. Boston Herald Wire Services, Boston Herald, 5 Feb. 2026 See All Example Sentences for ADP

Word History

Etymology

adenosine diphosphate

First Known Use

1942, in the meaning defined above

Time Traveler
The first known use of ADP was in 1942

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Cite this Entry

“ADP.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ADP. Accessed 26 Feb. 2026.

Kids Definition

ADP

noun
ˌā-ˌdē-ˈpē How to pronounce ADP (audio)
ā-ˈdē-ˌpē
: a compound formed in living cells that reacts to form ATP

Medical Definition

: a nucleotide C10H15N5O10P2 composed of adenosine and two phosphate groups that is formed in living cells as an intermediate between ATP and AMP and that is reversibly converted to ATP for the storing of energy by the addition of a high-energy phosphate group

called also adenosine diphosphate

Last Updated: - Updated example sentences
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