how i can define communication?

DEFINITION OF COMMUNICATION
The exchange of messages between human beings is known as communication. The peace of the world, the progress of an organization, and success of a person depend upon communication. We send and receive messages through words, pictures, signs, or body language. Communication may be verbal or nonverbal. Business communication is the exchange of messages in the business world.

Origin
The word "communication" comes from the Latin word, communicate, meaning to share, to have in common. From earliest times, communication and closely linked words such as commune, communion, and communicant have meant to share to partake, to exchange, and to hold in common.

Definition
"Communication means the search for all the available means of persuasion (Aristotle)
"Communication is the main highway to all human relations."
(Prof. Parkhurst)
"Communication is the action of conveying or exchanging information and ideas.