Sentence:  Hence the natural <WSD>language</WSD> of the mute is, in schools of this class, suppressed as soon and as far as possible, and its existence as a <WSD>language</WSD>, capable of being made the reliable and precise vehicle for the widest range of thought, is ignored. 
Meaning of the word marked with <WSD> tags:  A body of words, and set of methods of combining them (called a grammar), understood by a community and used as a form of communication.