mass action


Definition of mass action

1 : action involving masses of people a period of mass action in which the individual has often felt lost— F. E. Hill by one single mass action, to improve the case of workers on a scale never attempted— F. D. Roosevelt concerted, public, mass action— Eugene Dennis
2 : uncoordinated gross motor behavior : random or nonspecific responses characteristic especially of infants

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Learn More About mass action

Dictionary Entries Near mass action


mass action


See More Nearby Entries 

Statistics for mass action

Cite this Entry

“Mass action.” Dictionary, Merriam-Webster, Accessed 1 Dec. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Name that Thing: Flower Edition

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Love words? Need even more definitions?

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