Reactivity

(chemistry) The relative capacity of an atom, molecule, or radical to combine chemically with another atom, molecule, or radical.
(nucleonics) A measure of the deviation of a nuclear reactor from the critical state at any instant of time such that positive and negative values correspond to reactors above and below critical, respectively; measured in percent k, millikays, dollars, or in-hours.

1. The property of reacting.
2. The process of reacting.

The noun has 2 meanings:

Meaning #1: responsive to stimulation
  Synonym: responsiveness

Meaning #2: ready susceptibility to chemical change

Look up reactivity in Wiktionary, the free dictionary.

Generally, reactivity is something's responsiveness to stimulation, and may mean:

• Reactivity (chemistry), the rate at which a chemical substance tends to undergo a chemical reaction
• Reactive programming, a property of an execution model whereby changes are automatically propagated through a dataflow network
• Reactivity (psychology), a phenomenon which occurs when subjects alter their performance due to their awareness of being observed
• Nuclear chain reaction, a basic parameter describing kinetics and dynamics of nuclear reactors

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