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Enochian is a name often applied to an occult or angelic language recorded in the private journals of John Dee and his colleague Edward Kelley in late 16th century England. Dee straddled the worlds of science and magic just as they were becoming distinguishable, and Kelley was a spirit medium who worked with Dee in his magical investigations. The men claimed that the language was revealed to them by angels. Some contemporary scholars of magic consider it a constructed language that is nonetheless viable for magical workings, while other scholars of constructed languages simply consider it a very poor imitation of an ancient language, with grammar derived primarily from English. The language is integral to the practice of Enochian magic (Wikipedia page ).
The language found in Dee and Kelley's journals encompasses a limited textual corpus, only some of it with English translations. Several linguists, notably Donald Laycock (Wikipedia page ), have studied Enochian, and argue against any extraordinary features in the language.
Dee's journals did not describe the language as "Enochian", instead preferring descriptors like "Angelical", the "Celestial Speech", the "Language of Angels", the "First Language of God-Christ", the "Holy Language", or "Adamical" because, according to Dee's Angels, it was used by Adam in Paradise to name all things. The term "Enochian" comes from Dee's assertion that the Biblical Patriarch Enoch had been the last human (before Dee and Kelley) to know the language.
The reception of Enochian started on March 26, 1583, when Kelley reported visions in the crystal of the twenty-one lettered alphabet characteristic of the language. A few days later, Kelley started receiving what became the first corpus of texts in the purported Angelic language. This resulted in the book Liber Loagaeth ("Book [of] Speech from God"). The book consists of 49 great letter tables, or squares made of 49 by 49 letters (however, each table has a front and back side—making 98 49x49 tables in all). Dee and Kelley said the angels never bothered translating the texts in this book.
The other set of Enochian texts was received through Kelley about a year later, in Krakow. These are more important since they come with English translations, thus providing the basis for the Enochian vocabulary. The texts comprise 48 poetic verses, which in Dee's manuscripts are called "Claves Angelicae", or "Angelic Keys". The Keys are assigned certain functions within the magical system. Dee was apparently intending to use these Keys to "open the 49 Gates of Wisdom/Understanding" represented by the 49 magic squares in Liber Loagaeth:
'I am therefore to instruct and inform you, according to your Doctrine delivered, which is contained in 49 Tables. In 49 voices, or callings: which are the Natural Keys to open those, not 49 but 48 (for one is not to be opened) Gates of Understanding, whereby you shall have knowledge to move every Gate…' 'But you shall understand that these 19 Calls are the Calls, or entrances into the knowledge of the mystical Tables. Every Table containing one whole leaf, whereunto you need no other circumstances.'
While these texts contain most of the vocabulary, dozens of further words are found hidden throughout Dee's journals, and thousands of undefined words are contained in the Liber Loagaeth.
Aleister Crowley  researched and made use of Enochian.
Some of the many websites devoted to the Enochian language:
A Enochian website is here 
Enochian magic is described on the Wikipedia page 
The Angelical language wiki is here .
The Omniglot page is 
A dictionary is here 
Ancient Origins page 
(All checked October 2017)