adj. 1. having the properties of an alkali. Opposite of acidic. when used of aqueous solutions, it signifies that the solution has a pH greater than 7. Syn. -- alkaline (vs. acidic), basic [ WordNet 1.5 ]
(adj) relating to or containing an alkali; having a pH greater than 7, Syn. alkalic, Ant. amphoteric, acidic, Example:alkaline soils derived from chalk or limestone