nominative singular neuter (instrumental -tveva in emphatic juxtaposition: 'by eye-consciousness alone'; surface form is cakkhuviññāṇa + -tveva, instrumental + eva 'just, only')
Analysis. cakkhu (eye) + viññāṇa (consciousness). In the doctrine of the six sense-doors (chadvāra), cakkhuviññāṇa is the consciousness that arises specifically at the eye-base when eye and visible object meet. The phrase illustrates how contact (phassa) generates sensation (vedanā), which drives craving and clinging.
Etymology. cakkhu: from √cakṣ (to see), related to Sanskrit cakṣus and Latin oculus (both 'eye'). viññāṇa: from vi + √jñā (to know), 'knowing apart', hence consciousness as discriminative awareness. The -tveva construction uses instrumental -tva (abstract noun marker) + eva (emphatic particle), common in making emphatic nominalsused predicatively or in apposition.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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