alkaline means: PH higher than 7. Higher than 7. When in solution, alkalis contain too many hydroxylions. (in Cooking Dictionary)

What else does alkaline mean?

A term that refers to or contains an alkali. (in Merlin Dictionary)

A pH higher than 7. (in Merlin Dictionary)

A relatively low level of hydrogen ions. (in Merlin Dictionary)

A common disposable battery composed of zinc and manganese dioxide. (in Merlin Dictionary)