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INTRODUCTION
It is just a hundred years since Roget's Thesaunis of English Words and Phrases was first published. In the course of that century of unprecedented development and change our language and vocabulary have undergone modiiications and additions which have been dealt with from time to time in previous revisions of the work. But a new generation has grown up since the last recension, and the time seemed ripe for a more complete overhaul which would make it thoroughly up to date. Accordingly, the opportunity has been taken, in preparing this new single-volume edition, of giving the work as complete a revision as was possible, short of doing the whole compilation afresh. Every paragraph has been carefully reviewed, over 10,000 words and phrases have been added, and the articles have been ' tidied up ' so that all additions follow the logical order which agrees with the original plan.
In the course of its century of use Roget's Thesaurus has come to be as widely accepted and as indispensable to writers as a dictionary, and its system and arrangement have become so familiar that any radical alteration of them would lessen the value of the book to those who know their way about it from constant use. For that reason no attempt has been made to modify the main scheme which Roget originally laid down, and except for a few very minor alterations of numbering where the order had become confused the arrangement is the same as in previous editions. Within this scheme the articles have been greatly amplified and expanded, some of the pages containing up to a hundred fresh insertions.
The list of contents at the beginning sets out the plan of classification, and indicates the general divisions of the book. Readers who are interested in the detailed subdivisions of the classification will find them in the different paragraph headings, and the general principles of the work are explained in Roget's original Introduction, now printed at the end of the volume.
Technical Terms.
In giving some account of the additions which have been made, it is natural to start off with those technical terms which have been coined to fit modern scientific, poHtical, and cultural developments. The wide range of the subjects covered is shown by these typical examples taken at random: air-condition, airgraph, allergy, antibiotic, Appleton layer, bathysphere, Dadaism, deviationist, diarchy, displaced person, electrolysis, existentialism, fifth column, Gallup poll, geriatrics, Heaviside layer, hydroponics, intercom, ionosphere, iron curtain, libido, liquidate, parapsychology, psychotherapist, quisling, radar, robot, rotor, stratosphere, surrealism, telekinesis, television, troposphere, weather station.