A diagram that exhibits a relationship, often functional, between two sets of numbers as a set of points having coordinates determined by the relationship. Also called plot. A pictorial device, such as a pie chart or bar graph, used to illustrate quantitative relationships. Also called chart. To represent by a graph. To plot (a function) on a graph. The spelling of a word. Any of the possible forms of a grapheme. A written character that represents a vowel, consonant, syllable, word, or other expression and that cannot be further analyzed.