a. Added to roots or forms conceived as roots -
| NOM. | -or, M. | -es, F. | -us, N. |
| GEN. | -óris | -is | -eris or -oris |
| STEM | ór- (earlier ós-) | i- | er- (earlier eos-) |
| tim-or, fear; | timére, to fear. |
| am-or, love; | amáre, to love. |
| séd-és, seat; | sedére, to sit. |
| caed-és, slaughter; | caedere, to kill. |
| genus, birth, race; | GEN, to be born (root of gignó, bear). |
b. Apparently added to roots or verb-stems -
|
NOM. | -ió, F. | -tió (-sió), F. | -túra (-súra), F. | -tus, M. |
| GEN. | -iónis | -tiónis (-siónis) | -túrae (-súrae) | -tús (-sús) |
| STEM | ión- | tión- (sión-) | túrá- (súrá-) | tu- (su-) |
| leg-ió, a collecting (levy), a legion; | legere, to collect. | |
| reg-ió, a direction, a region; | regere, to direct. | |
| vocá-tió, a calling; | vocáre, to call. | |
| mólí-tió, a toiling; | mólírí, to toil. | |
| scríp-túra, a writing; | scríbere, to write. | |
| sén-sus (for sent-tus), feeling; | sentíre, to feel. |
NOTE 1: -tió, -túra, -tus are added to roots or verb-stems precisely as -tor, with the same phonetic change (cf. § 236. a. N.1). Hence they are conveniently associated with the supine stem (see § 178). They sometimes form nouns when there is no corresponding verb in use: as, senátus, senate (cf. senex); mentió, mention (cf. méns); fétúra, off-spring (cf. fétus); litterátúra, literature (cf. litterae); cónsulátus, consulship (cf. cónsul).
NOTE 2: Of these endings, -tus was originally primary (cf. § 234. II. 3.); -ió is a compound formed by adding ón- to a stem ending in a vowel (originally i): as, dició (cf. -dicus and dicis); -tió is a compound formed by adding ón- to stems in ti-: as, gradátió (cf. gradátim); -túra is formed by adding -ra, feminine of -rus, to stems in tu-: as, nátúra from nátus; statúra from status (cf. figúra, of like meaning, from a simple u- stem, figu-s; and mátúrus, Mátúta).