a book prepared for use in schools or colleges; "his economics textbook is in its tenth edition"; "the professor wrote the text that he assigned students to buy"
uttered through the medium of speech or characterized by speech; sometimes used in combination; "a spoken message"; "the spoken language"; "a soft-spoken person"; "sharp-spoken"
a statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other