“Roget’s Thesaurus is an oddball philosophy of language masquerading as a reference book”*…
Austin Kleon on Roget’s Thesaurus…
I have always assumed — and maybe you have, too — that a thesaurus is just a synonym dictionary, the words arranged alphabetically with a list of synonyms and antonyms below. Somehow, every thesaurus I’d ever come across — even ones with “Roget” in the title! — had this alphabetic arrangement.
Because of this, it was easy for me to effectively ignore the thesaurus. If I needed a synonym or antonym, I’d just open an actual dictionary, or do a quick online search…
It turns out that Roget‘s Thesaurus is not at all what I thought it was. It is weirder and much more interesting…
… if you understand the man, you understand where his book came from. Peter Mark Roget (1779-1869) was a Victorian polymath: a doctor by trade, but he did all sorts of stuff: he was a consultant on pandemics, he wrote Encyclopedia Brittanica entries and a book about natural theology, he helped catalog several libraries, he invented the scale on the slide rule, and he may have written a paper that contributed to the birth of cinema. Oh, and he was also obsessed with chess problems.
The thing he is now most famous for — his thesaurus — was actually a side project he took up in retirement, in his seventies. His whole life he’d made lists as a way of soothing himself. He carried a notebook around with him and jotted down lists of related words and phrases to help him with his own writing and lecturing. He made his own personal thesaurus in his twenties, but in retirement he thought maybe it might be helpful to others, and after four years of work, he published the first edition of his Thesaurus (from the Greek word thēsauros, meaning “storehouse” or “treasure”) in 1852, overseeing new editions until he died in 1869. His son, John Lewis Roget, a lawyer, painter, and art critic, then took over the project.
Roget, like many Victorians, was obsessed with order and classification. His hero was Carl Linnaeus, known as the father of modern taxonomy. Roget wanted to classify and organize words in the English language. This is the best way to understand Roget’s Thesaurus: it’s not just a book of words, it’s like a library of words.
When you go to the library, the books are not arranged in alphabetical order — they’re organized topically. In order to find a book in my local library, you have to look up the book in the catalog, note the Dewey Decimal Number, then find it on the shelf. The beauty of this system, and a major argument for physical browsing collections, is that when you find the book on the shelf, it will be surrounded by books on the similar subject. You may go looking for one particular book and while browsing you might find a better book or the book you didn’t even know you were looking for. This is the way a thesaurus is supposed to work.
In the very beginning of his introduction to his book, Roget emphasizes that what makes his book unique and helpful is that the words are not arranged alphabetically, like a Dictionary, but “according to the ideas which they express.”…
The fascinating story of Roget’s Thesaurus: “A Library of Words,” from @austinkleon.
Browse the 1911 edition– still in the format Roget intended– at the Internet Archive.
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As we look it up, we might send tasty birthday greetings to the literary genius behind green eggs and ham, Theodor Seuss Geisel, AKA “Dr. Seuss”; he was born on this date in 1904. After a fascinating series of early-career explorations, Geisel settled on a style that created what turned out to be the perfect “gateway drug” to book addiction– and a love of words– for generations of young readers.
The more that you read,
The more things you will know.
The more that you learn,
The more places you’ll go.
– I Can Read With My Eyes Shut! (1978)

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