The Multifunctional Role of "daiin" in the Voynich Manuscript: A Hypothesis of Contextual Particle Functions

This paper proposes a novel hypothesis regarding the most frequent sequence in the Voynich manuscript, daiin. Instead of interpreting it as meaningless filler, a suffix, or statistical artifact, this study suggests that daiin functioned as a contextual particle — a versatile operator whose meaning varied depending on its position (initial, medial, final) and surrounding context. Drawing on comparative evidence from Greek, Latin, Slavic, German, Chinese, and Japanese, the hypothesis argues that daiin could operate both as a connector (“and,” “with,” “or”) and as a punctuation-like marker (comma, question, emphasis). The high frequency of daiin thus reflects grammatical necessity rather than noise. Illustrative examples demonstrate how its role may shift according to placement, while historical evidence on 15th-century European punctuation supports its dual nature as both word and marker. To the best of the author’s knowledge, this is a novel hypothesis not previously proposed in Voynich studies.