| A | B |
| sacer, sacra, sacrum | holy, consecrated |
| sanguis, sanguinis, m | blood, race, descendant |
| saxum, saxi, n | stone, rock, reef |
| sed | but, moreover, however |
| sedes, sedis, f | seat, abode, habitation |
| sequor, sequi, secutus | follow, attend, pursue |
| servo, servare, servavi, servatum | observe, watch, guard, protect |
| si | whether, if |
| sic | thus, so, in this manner |
| sidus, sideris, n | star, constellation |
| silva, silvae, f | forest |
| simul | at the same time, together |
| socius, socii, m | ally, comrade |
| solus, sola, solum | alone, only |
| somnus, somni, m | sleep, dream |
| sto, stare, steti, statum | stand, halt, endure |
| sub | under, beneath |
| subeo, subire, subivi, subitum | go under, enter; bear |
| sublatus | perf. pass. pple. of tollo |
| sui, sibi, se, se | himself, herself, itself |
| sum, esse, fui, futurus | be |
| summus, summa, summum | highest, greatest |
| super | above, beyond |
| superus, supera, superum | upper, higher; as subst.: god |
| supremus, suprema, supremum | uppermost, highest |
| surgo, surgere, surrexi, surrectum | rise up, surge |
| suus, sua, suum | his, her, its, their |
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