1. Capable of acting on or influencing each other
   - interactive

See also: interaction, mutual, reciprocal

• active birth
• active citizen
• active immunity
• active matrix screen
• active placebo
• active site
• active transport
• active trust
• active voice
• actively
• activeness
• activewear
• activism
• activist
• activistic
• activity
• actomyosin
• actor
• actor's agent
• actor's assistant
• actor's line
• actress
• Acts
• Acts of the Apostles
• actual