/kəˌmjuːnəˈkeɪʃən/. noun. plural communications. Learner's definition of COMMUNICATION. 1. [noncount] : the act or process of using words, sounds, signs, or behaviors to express or exchange information or to express your ideas, thoughts, feelings, etc., to someone else.human communication.nonverbal communication.He is studying insect communication.kəˌmjuːnəˈkeɪʃən/. noun. plural communications. Learner's definition of COMMUNICATION. 1. [noncount] : the act or process of using words, sounds, signs, or behaviors to express or exchange information or to express your ideas, thoughts, feelings, etc., to someone else.