: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Even with global unemployment at historically low levels, fewer than one in four workers strongly believe their job is safe from being eliminated, according to ADP Research. Caroline Castrillon, Forbes.com, 5 July 2026 Nieporte filed a federal lawsuit in May against human resources company ADP Totalsource for its role in his firing, seeking at least $30 million. Jason Ma, Fortune, 5 July 2026 Private payroll data from ADP released yesterday came in below what economists anticipated for June. Alex Harring, CNBC, 2 July 2026 Private hiring in the US expanded at a steady pace in June, according to payment firm ADP. Jake Angelo, semafor.com, 1 July 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

Browse Nearby Words

Cite this Entry

“ADP.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ADP. Accessed 6 Jul. 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

Love words? Need even more definitions?

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

More from Merriam-Webster