Language refers to a system of communication used by people to express ideas, thoughts, and feelings. It includes spoken words, written symbols, and body gestures that we understand and use to interact with one another. Full definition
The time has come for us to encourage the study of languages of regions other than one's own for research. (religion-online.org)
Both the number of tablets and concentration in urine were associated with a significant increase in language delay in girls, and a slight but not significant decrease in boys. (sciencedaily.com)