Base

**Semantic type:** Chemical Viewed Functionally

**Definition:** A substance that dissociates to give hydroxide ions in aqueous solutions; a substance capable of donating a pair of electrons (to an acid) for the formation of a coordinate covalent bond; a substance whose molecule or ion can combine with a proton (hydrogen ion); a substance that combines with acids to form salts.

**Synonyms:** - Basic - alkali - alkalinity - base