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Most nouns of the Fourth Declension are formed from verb-stems, or roots, by means of the suffix -tus (-sus) (§ 238. b):

a. Many are formed either from verb-stems not in use, or by analogy:

b. The accusative and the dative or ablative of nouns in -tus (-sus) form the Supines of verbs (§ 159. b): as, spectátum, petítum; dictú, vísú.

c. Of many verbal derivatives only the ablative is used as a noun: as, iussú (meó), by (my) command; so iniussú (populí), without (the people's) order. Of some only the dative is used: as, dívísuí.