The Klingon Dictionary (TKD) is a book by Marc Okrand describing the Klingon language. First published in 1985 and then again with an addendum in 1992, it includes pronunciation, grammar and vocabulary. It has sold more than three hundred thousand copies and has been translated into five languages. The book is a description of the grammar with a few examples for every rule. It is not suitable for active learning and practice of the language, because it does not contain any exercises. It has never been intended as a learning book. Its source was intended as a guide for scriptwriters and actors. It was only later sold for merchandising for Star Trek fans. Source: Wikipedia (en)