1. (a.) Of or pertaining to the Letts; Lettish.

2. (a.) of or pertaining to a branch of the Slavic family, subdivided into Lettish, Lithuanian, and Old Prussian.

3. (n.) The language of the Letts; Lettish.

4. (n.) The language of the Lettic race, including Lettish, Lithuanian, and Old Prussian.