| AC | an electric current that reverses direction sinusoidally |
|---|---|
| AC | a radioactive element of the actinide series |
| AC | any of various spiny trees or shrubs of the genus Acacia |
| AC | Australian tree that yields tanning materials |
| AC | scrubby Australian acacia having extremely foul-smelling blossoms |
| AC | East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat pods |
| AC | evergreen Australasian tree having white or silvery bark and young leaves and yellow flowers |
| AC | tropical American thorny shrub or small tree |
| AC | tall Australian acacia yielding highly valued black timber |
| AC | shrubby Australian tree having clusters of fragrant golden yellow flowers |
| AC | African tree supposed to mark healthful regions |
| AC | the academic world |