What is the meaning of Activator?

One who, or that which, activates.

Something that activates a catalyst

Any chemical or agent which regulates one or more genes by increasing the rate of transcription.

A type of effector that increases the rate of enzyme-mediated reactions.

A type of dopant used in phosphors and scintillators.

An agent that enables the flotation of a mineral or minerals.

A hand-held device that delivers a controlled fast thrust to a joint, muscle, etc., to help stimulate nervous system activity.

activator

Source: wiktionary.org