Sentence:  Of the two , Porter is justly the better known , for he went far beyond the vital finding of fiction for films to take the first step toward fashioning a <WSD>language</WSD> of film , toward making the motion picture the intricate , efficient time machine that it has remained since , even in the most inept hands . 
Meaning of the word marked with <WSD> tags:  a systematic means of communicating by the use of sounds or conventional symbols