[ree-ak-tiv-i-tee] 
| 1. | the quality or condition of being reactive. |
| 2. | Chemistry. the relative capacity of an atom, molecule, or radical to undergo a chemical reaction with another atom, molecule, or compound. |
| 3. | Physics. a measure of the deviation from the condition at which a nuclear reactor is critical. |
| 4. | Immunology. the ability of an antigen to combine with an antibody. |
| re·ac·tive (rē-āk'tĭv) adj.
|
reactivity re·ac·tiv·i·ty (rē'āk-tĭv'ĭ-tē)
n.
The property of reacting.
The process of reacting.
ækˈtɪv