Consisting of or expressed with two letters, especially referring to word roots or linguistic elements.
From Latin 'bi-' (two) + 'littera' (letter). This term developed in linguistics and comparative philology to describe ancient language roots that consisted of only two consonants.
Many ancient Semitic languages like Hebrew and Arabic build words from just two or three letter roots—so 'biliteral' roots are like the DNA code of those languages!
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