1. substances or agents that cause something to become active or start working
Usage: chemistry; biology
2. people who encourage others to take action or become involved
3. devices or mechanisms that turn on or start the operation of something
Usage: technology

Examples

• The enzyme activators speed up the chemical reaction.
• Community activators organized the neighborhood cleanup.
• The security system uses motion activators to detect intruders.
• Protein activators help regulate gene expression in cells.
• The political activators rallied voters for the campaign.
• Remote activators can start the car engine from a distance.
• Chemical activators are added to improve the catalyst’s performance.