Fourth century BC Greek hydraulic semiphore, perhaps tribal drums or smoke signals.
Full form of ITU-T is International Telecommunication Union-Telecommunication .
Telecommunication is communication over a distance by cable, telegraph, telephone, or broadcasting. Cables are used for telecommunication. Telegraph is one form of telecommunication.
Society for worldwide interbank financial telecommunication
EMIRATES TELECOMMUNICATION CORPORTION.
air telecommunication
institution of electronics and telecommunication
The earliest form of exchange was known as barter
Electronics and Telecommunication Engineering.
Department of telecommunication.....
The full form of ITU in standards is the International Telecommunication Union. It is a specialized agency of the United Nations that focuses on developing international standards and regulations for telecommunications and information and communication technologies.
The way the word is defined plays a large part in the answer. This is explained in more detail on the Wikipedia site that has been added below the answer information in a related link. But for instance a telephone or the telegraph communication would come before a telecommunication from a satellite and the earliest form of commutation over distance would be from fire or drums. Wireless radio communication began in the early 1900s
Zhong Xing Telecommunication Equipment (ZTE)