| A | B |
| Semi | Half |
| verify | to prove the truth of something |
| semifinal | the round that comes before the final round in a tournament |
| sub | under |
| subconscious | existing in the mind beneath consciousness |
| subordinate | belonging in a lower order or rank; of less importance |
| super | above |
| supervisor | a person who oversees the work of others |
| superlative | the highest degree of comparison |
| tele | far |
| telescope | an instrument used to make distant objects appear larger and nearer |
| telepathy | communication between minds without sensory perception |
| tract | pull |
| traction | the friction of a surface on another surface |
| distract | to draw away one's attention |
| ver | true |
| veracious | truthful, honest |
| semiannual | occurring 2 times a year, usually every 6 months |