The phrase 'a medium of communication' is correct and usable in written English.
You could use it for example to refer to the various ways people can communicate with each other, such as email, telephone, text messaging, etc. For example, "In today's world, the internet is a key medium of communication".
The internet began as a medium of communication.
You can understand video games as a medium of communication, or as an emerging art form, only by playing them.
As a medium of communication, visual art often uses narrative subject matter, from history and scripture to diaristic introspection and private fantasy.
The batteries are also used to power radios, Mr. Van Vuuren said, as important a medium of communication in Africa as the cellphone.
After the publication of the third volume, Sartre changed his mind concerning the usefulness of the novel as a medium of communication and turned back to plays.
Língua-geral, lingua franca developed in Brazil under Portuguese influence in the 16th and 17th centuries as a medium of communication between Europeans and Indians and between Indians of different languages.
The study makes relevant contribution in the area of CSRR in the context of Ghana, judging from the fact that the concepts CSR and CSRR are relatively new and also adds literature to a fairly growing area of CSR communications via websites which are fast becoming a medium of corporate communication for corporations in Ghana and beyond.
The language of dance became a medium of international communication without regard for difference in geography or spoken language.
In this manner Chinese logographs form a common medium of communication for a vast country because they can be read by people who speak mutually incomprehensible dialects or languages.
And so a hunk of Cheddar becomes superior to Nevermind: a universal medium of communication; or at least, for foodists, a universal solvent of the intellect.
For sure, this instance of social meaning requires some means of expression, and for this we need an intersubjective medium of communication, a conventionalized coding system, which can be considered as the text as product, an "output, something that can be recorded and studied, having a certain construction that can be represented in systematic terms" (Halliday 1985: 10).
