Not being a linguist by profession, understanding only one language and that very poorly, this Glossary has evolved gradually during the past two or three decades from a wide variety of sources.
The primary sources are the Concise Oxford English Dictionary, the Oxford English Dictionary on CD-ROM, Apple Mac’s online version of the Oxford Dictionary of English, The Oxford Dictionary of English Etymology, Chambers Dictionary of Etymology, Bloomsbury’s Dictionary of Word Origins, Eric Partridge’s Origins: An Etymological Dictionary of Modern English, and recently Douglas Harper’s Online Etymological Dictionary.
To go back to the original Indo-European languages, I mainly use Cassell’s Latin Dictionary, the Pocket Oxford Classical Greek Dictionary, Shambhala’s The Encyclopedia of Eastern Philosophy and Religion, and M. Monier-Williams’ A Sanskrit-English Dictionary. And to go further back to the supposed PIE language itself, I use Indo-European Language and Culture by Benjamin W. Forston IV and The American Heritage Dictionary of Indo-European Roots, revised and edited by Calvert Watkins, in both electronic and printed form.
In turn, this is based on Indogermanisches etymologisches Wörterbuch (Indo-European Etymological Dictionary) published in 1959 by Julius Pokorny. This is still today the most comprehensive source on the subject, although not fully up to date with the latest scholarly researches.
The PIE roots of Sanskrit and European languages are especially interesting for they denote roots that are common ancestors of many words that may appear to be morphologically different, rather like the evolution of the species.
To denote these common ancestors, the terms in this Glossary include references to the most important PIE roots, as simplified by Forston, where they are known and exist.
It is important to note that this Glossary is not intended as a work of scholarship. For myself, the way I use it is to develop a picture in my mind of the evolution of language, illustrating all evolutionary processes in general, which culminate in Ineffable Wholeness, exquisitely transcending all categories of language, as illustrated by the meaning triangle.