From the Foreword
More than forty years have passed since its first publication under the Teach Yourself imprint. During that time both English and Esperanto have grown and changed considerably. This new edition, published by Mondial, attempts as far as possible to reflect these developments, both by the addition of new headwords and by many other changes and improvements.
Forty years ago computers were in their infancy. There was no internet.

I have taken the opportunity to make better provision for American and international English. Accordingly I have added new headwords such as cilantro, maven, mononucleosis, and zucchini. I have also supplied American meanings to words already included, such as muffler as the equivalent of British silencer.
An important sentiment among Esperanto speakers in recent years is that sparked by Claude Piron’s booklet La Bona Lingvo: the desirability of thoroughly exploiting the latent capacities of existent lexical material of the language rather than creating new lexical material, particularly from French or other European languages. This dilemma has faced Esperanto since the earliest days. Was ‘hospital’ adequately expressed as the multi-affixed malsanulejo or should we add (as we did) a new single-root word hospitalo? For ‘duodenum’ should we say dekdufingra intesto (as is done in many languages, though not in English), or do we need duodeno? Is a ‘constellation’ stelfiguro or konstelacio? (Neither duoden/ nor konstelaci/ belongs to the “official” rootstock as determined by the Akademio de Esperanto.) In the English-Esperanto part, for various cases of this type in which usage has not settled down, I have decided to give both possibilities, so that the user can choose between them. For others I have given just my own recommendation. In the Esperanto-English part I have been more ready to include roots which many speakers, myself included, would disapprove of. I have marked some of them with the sign ☹ (‘deprecated’); for others I have merely supplied alternative forms in square brackets.
In the form and meaning of Esperanto roots I have generally followed the standard dictionary Plena Ilustrita Vortaro de Esperanto 2005 (Paris: SAT). However, I remain unconvinced by PIV’s decision to alter various established biological terms to make them agree with Latin scientific nomenclature. For example, I have retained the forms alcion/o ‘kingfisher’ and cipres/o ‘cypress’ as laid down in the Fundamento de Esperanto, rather than replace them with alced/o and kupres/o as in PIV. For ‘brain’ I retain cerb/o, rejecting PIV’s cerebr/o.
John Wells