| A | B |
| semiannual | twice a year |
| semicircle | half of a circle |
| semicolon | a punctuation mark used to connect to sentences (;) |
| semiconscious | partly conscious; half awake |
| semiprivate | a room shared with another person, as in a hospital |
| semisweet | half bitter and half sweet |
| hemisphere | one half of the earth |
| semipermeable | allows some but not all substances to pass or filter through something |
| semiformal | partly formal (i.e. men's clothes--formal: tux; semiformal: suit |
| semisolid | part solid and part liquid; more solid than liquid (i.e. mashed potatoes) |
| semiliquid | part liquid and part solid; more liquid than solid (i.e. a very thick milk shake) |