verb (used with or without object), ag·glom·er·at·ed, ag·glom·er·at·ing.

  1. to collect or gather into a cluster or mass.


  1. gathered together into a cluster or mass.
  2. Botany. crowded into a dense cluster, but not cohering.


  1. a mass of things clustered together.
  2. rock composed of rounded or angular volcanic fragments.

verb (əˈɡlɒməˌreɪt)

  1. to form or be formed into a mass or cluster; collect

noun (əˈɡlɒmərɪt, -ˌreɪt)

  1. a confused mass
  2. a rock consisting of angular fragments of volcanic lavaCompare conglomerate (def. 2)

adjective (əˈɡlɒmərɪt, -ˌreɪt)

  1. formed into a mass

1680s, from Latin agglomeratus, past participle of agglomerare “to wind or add onto a ball,” from ad- “to” (see ad-) + glomerare “wind up in a ball,” from glomus (genitive glomeris) “ball of yarn,” from PIE root *glem-. Related: Agglomerated; agglomerating.

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