Present and ready for use; at hand; accessible: kept a fire extinguisher available at all times. Capable of being gotten; obtainable: a bedspread available in three colors. Qualified and willing to serve or assist: a list of available candidates; was not available for comment. Chemistry Capable of being used in a chemical reaction: available electrons. Botany Present, as in soil, and capable of being used by plants as a nutrient: available water; available minerals. Archaic Capable of bringing about a beneficial result or effect. Law Archaic Valid. Used especially of a plea.