variant spelling of ad- assimilated before c, k, and q (as in accept, acquit, and acquiesce).
forming adjectives which are often also (or only) used as nouns, such as maniac
the chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores
an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies
an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies