cardinal number
Analysis. catunnaṃ (genitive plural of catu, "of four") + ca (conjunction, "and"); the phrase means "and of four" or "of the four".
Etymology. From Proto-Indo-European *kʷetwr̥, the same root as Latin quattuor, English four, and Sanskrit catvāri. The -nnaṃ ending represents the genitive plural form of the o-stem declension. The concrete imagery of "four" persists in contexts like the Four Noble Truths (cattāri ariya-saccāni) and the four paths to power (iddhipāda).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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