From Proto-Italic *dekem, from Proto-Indo-European *déḱm̥. Cognates include Sanskrit दश (daśa), Ancient Greek δέκα (déka), Gothic 𐍄𐌰𐌹𐌷𐌿𐌽 (taihun) and Old English tīen (English ten).
num
indeclinableten; 10
“Caesar exposito exercitu et loco castris idoneo capto, ubi ex captivis cognovit quo in loco hostium copiae consedissent, cohortibus decem ad mare relictis et equitibus trecentis, qui praesidio navibus” — Caesar, having disembarked his army and chosen a convenient place for the camp, when he discovered from the prisoners in what part the forces of the enemy had lodged themselves, having left ten cohort
“sic magna fuit censuque virisque perque decem potuit tantum dare sanguinis annos” — Thus Troy stood great in wealth and men, and for ten years was able to give freely of her blood.
“et audientes decem coeperunt indignari de Iacobo et Iohanne” — And when the ten heard it, they began to be much displeased with James and John.