Communication
Communication was the means of establishing a connection or transferring information from one being or mechanism to another, specifically, the ability to "[respond] to visual and auditory stimuli." () The study of communication was known as communications. 

To the Organians, "[t]alking is a limited form of communication for us." () Likewise, according to the Bajoran Prophets, "[l]inguistic communication is tiresome." ()

When the  became entrapped in a cluster of two-dimensional beings,  the crew attempted to "isolate any signal patterns" from it in order to establish "a basis for communication." ()

When tasked with the mission of establishing contact with the "incomprehensible" Tamarians, Captain Jean-Luc Picard approached the challenge optimistically, stating, "[i]n my experience, communication is a matter of patience, imagination." ()

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Communication