In a term-document matrix, each row represents a word in the vocabulary and each term-document matrix column represents a document from some collection of documents. Fig. 6 .2 shows a small selection from a term-document matrix showing the occurrence of four words in four plays by Shakespeare. Each cell in this matrix represents the number of times a particular word (defined by the row) occurs in a particular document (defined by the column). Thus fool appeared 58 times in Twelfth Night.