from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Composed of two letters
- adj. Written in two different scripts
from the GNU version of the Collaborative International Dictionary of English
- adj. Consisting of two letters.
from The Century Dictionary and Cyclopedia
- Consisting of two letters: as, a biliteral root in language.
- n. A word, root, or syllable formed of two letters.
bi- + literal (Wiktionary)