n. The science and technology of communication at a distance by electronic transmission of impulses, as by telegraph, cable, telephone, radio, or television. Often used in the plural with a singular verb: Telecommunications is an important area of professional growth. n. The electronic systems used in transmitting messages, as by telegraph, cable, telephone, radio, or television. Often used in the plural with a plural verb: Telecommunications were disrupted by the brownout. n. A message so transmitted.