| A | B |
| saepe | (adv) often |
| sagitta | -ae, f., arrow |
| salus | salutis, f., safety, welfare, health |
| salvus | -a, -um, safe |
| satis | ( indeclineable adj. & adverb) enough |
| schola | -ae, f., school |
| scientia | -ae, f., knowledge |
| scio | scire, scivi, scitus, know |
| scribo | scribere, scripsi, scriptum, write |
| scutum | -i, n., shield |
| secundus | -a, -um, second |
| sed | (conj.) but |
| sedeo | -ere, sedi, sessurus, sit |
| semper | (adv) always |
| senator | -oris, m., senator |
| senatus | -us, m., senate |
| sententia | -ae, f., feeling, opinion |
| sentio | -ire, sensi, sensus, feel, perceive |
| septem | seven |
| septimus | -a, =um, seventh |
| sequor | sequi, secutus sum, follow |
| servo | -are, -avi, -atus, save,keep |
| servus | -i, m., slave |
| sex | six |
| sextus | -a, -um, sixth |
| si | (conjunction) if |
| sic | (adv) thus, so |
| signum | -i, n., signal, standard |
| silentium | -i, n., silence |
| silva | -ae, f., forest, woods |
| similis | -e, similar, like |
| simul | (adv) at the same time |
| simul atque (simul ac) | (adv) as soon as |
| sine | ( + abl) without |
| singuli | -ae, -a, one at a time |
| sinister | -tra, -trum, left |
| socius | -i, m., ally, comrade |
| sol | solis, m., sun |
| solum | (adv) only |
| solus | -a, -um, alone, only |
| solvo | -ere, solvi, solutus, loosen, set sail |
| somnus | -i, m., sleep |
| soror | -oris, f., sister |
| spatium | -i, n., space, distance |
| species | -ei, f., appearance, sight |
| specio | -ere, spexi, spectus, see |
| specto | -are, -avi, -atus, look at |
| spes | spei, f., hope |
| spero | -are, -avi, -atus, hope |
| statim | (adv) immediately |
| statua | -ae, f., statue |
| statuo | -ere, statui, statutus, station, decide, establish |
| sto | stare, steti, status, stand |
| studeo | -ere, studui ( + dat. of thing desired) be eager for, desire |
| studium | -i, n., eagerness, enthusiasm |
| sub | ( + acc) up under, close to |
| sub | ( + abl.) under, underneath |
| subito | (adv) suddenly |
| subsequor | -sequi, -secutus sum, follow closely |
| subsidium | -i, n., aid |
| sui | (gen. of reflexive pronoun) of himself, of herself, of itself |
| sum | esse, fui, futurus, be, exist |
| summus | -a, -um, highest, top of |
| sumo | sumere, sumpsi, sumptus, take |
| super | (+ acc.) above |
| superior | superius, higher, upper |
| supero | -are, -avi, -atus, defeat, surpass |
| superus | -a, -um, upper |
| supra | (adv) above |
| suscipio | -ere, -cepi, -ceptus, undertake |
| suspicio | -onis, f., suspicion |
| sustineo | -ere, -tinui, -tentus, hold up, withstand |
| suus | -a, -um ( 3rd person possessive reflexive adj.) his own, her own, its own, their own |
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