One of the mysteries of the English language finally explained.
Principle of individuation.
Mid 17th century; earliest use found in George Gillespie (1613–1648), Church of Scotland minister and theologian. From post-classical Latin principium individuationis from classical Latin principium + post-classical Latin individuationis, genitive of individuatio.
principium individuationis/prɪnˈsɪpɪəm ˌɪndɪˌvɪdʒʊˌeɪʃɪˈəʊnɪs//prɪnˈkɪpɪəm ˌɪndɪˌvɪdjuːˌɑːtɪˈəʊnɪs/
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