conglomerate

Short definition from Wiktionary

Noun

1. 1
   A cluster of heterogeneous things.
2. 2
   A corporation formed by the combination of several smaller corporations whose activities are unrelated to the corporation's primary activity.
3. 3
   A rock consisting of gravel or pebbles embedded in a matrix.

Adjective

1. 1
   Clustered together into a mass.
2. 2
   Composed of fragments of rock, pebbles, or stones cemented together.

Verb

1. 1
   To combine together into a larger mass.
2. 2
   To combine together into a larger corporation.