1. A typewriter, comprising: a dictionary memory having a multiplicity of data memory locations identified by respective addresses, each of said data memory locations including a word-data memory location which stores word data representative of a respective word of one language, and a related-data memory location for storing related data representing associated information associated with said word in the corresponding word-data memory location, said associated information being selected from a group consisting of a synonym, an antonym, and an equivalent word in another language, of the word in said corresponding word-data memory location, said word data in the word-data memory location at each one of said addresses comprising at least one character code each representing a letter of said word, or at least one of said character codes and at least one special code each representing a combination of at least two adjacent letters of said word which are identical with corresponding adjacent letters of a word represented by respective word data in the word-data memory location at an adjacent address which is adjacent to said each one of said addresses, said word data stored in said word-data memory locations being arranged in alphabetical order; a keyboard having a multiplicity of character keys operable to enter letters of a selected word of said one language, a call key, and a print-commanding key; control means connected to said dictionary memory and said keyboard, and having retrieval means for retrieving upon operation of said call key said associated information associated with said entered word; a working memory, connected to said keyboard and said retrieval means, for storing said entered word and the retrieved associated information; display means operable under the control of said control means; and a printing device operable under the control of said control means; said control means being responsive to said character keys for commanding said display means to indicate said entered word, responsive to said call key for commanding said display means to indicate said entered word, along with the respective associated information when said entered word is the same as a word represented by word-data in a respective word-data memory location, and responsive to said print-commanding key for commanding said printing device to print said entered word if said print-commanding key is operated when said display means displays no retrieved associated information responsive to said call key for the respective entered word displayed, and to print said retrieved associated information if said print-commanding key is operated when respective retrieved associated information is indicated on said display means along with the respective entered word responsive to the call key; and said retrieval means of said control means for retrieving said associated information being operable to search for said entered word by a process which includes defining a first range of said word-data memory locations for said searching for said entered word in said dictionary memory depending upon the first letter of said entered word, determining one of said word-data memory locations in said dictionary memory that is in the middle of said first range, and determining between which one of said word-data memory locations defining said first range and said middle worddata memory location said entered word would lie if stored in a respective one of said data memory locations, and defining a smaller range between the respective one of said word-data memory locations defining said first range and said middle word-data memory location, and repeating said determining of a middle word-data memory location for said smaller range and of between which one of the word-data memory locations defining the smaller range and the middle word-data memory location said entered word would lie if stored in said word-data memory, for successively smaller ranges in said word-data memory, until the entered word is located in said word data memory or it is determined that said entered word is not stored in said word-data memory.