offers a frequently updated, 240+ page authorized dictionary of the Na'vi language. Amazon.com.au Content Highlights Characters

: A companion book that provides a broader look at the lore and environment of the first film and the franchise's general world-building. Na'vi-English Dictionary (PDF)

If the DK book is out of your budget or unavailable, consider these official secondary resources:

“Dr. Thorne,” the figure said, its lips moving in perfect sync with a translator that shouldn’t exist. “You have been completing the text.”