01. consultant= 1 someone whose job is to give advice on a particular subject

e.g. a management consultant

2 British English a hospital doctor of a very high rank who has a lot of knowledge about a particular area of medicine

02. merger= noun [countable]

the joining together of two or more companies or organizations to form one larger one

e.g. merger of/between

a proposed merger between two of the largest software companies

merger with

There has been a lot of talk about a merger with another leading bank.

merger negotiations

03. acquisition= 1 [uncountable] the process by which you gain knowledge or learn a skill

the acquisition of language

2 [uncountable] the act of getting land, power, money etc

acquisition of: the acquisition of new sites for development

3 [countable] formal something that you have obtained by buying it or being given it

The Art Society is holding an exhibition of recent acquisitions.

04 venture= a new business activity that involves taking risks

business/commercial venture

joint venture (=when two companies do something together)