conglomerate
noun /kənˈɡlɒmərət/
  /kənˈɡlɑːmərət/
 - [countable] (business) a large company formed by joining together different firms
- He turned the business into a huge media conglomerate.
 
Extra ExamplesTopics Businessc2- the giant pharmaceutical conglomerates
 - one of seven global media conglomerates that dominate the industry
 - a/an chemical/industrial/engineering/mining conglomerate
 - a/an vast/international/multinational conglomerate
 
Oxford Collocations Dictionaryadjective- big
 - giant
 - huge
 - …
 
 - [singular] (formal) a number of things or parts that are put together to form a whole                                     
 - [uncountable] (geology) a type of rock made of small stones held together by dried clay
 
Word Originlate Middle English (as an adjective describing something gathered up into a rounded mass): from Latin conglomeratus, past participle of conglomerare, from con- ‘together’ + glomus, glomer- ‘ball’. The geological sense dates from the early 19th cent.; the other noun senses are later.