1. (biology) a hypothetical force (not physical or chemical) once thought by Henri Bergson to cause the evolution and development of organisms
   - life force, vital force, vitality

Type of: force

• sociable
• sociableness
• sociably
• social
• social action
• social activity
• social affair
• social anthropologist
• social anthropology
• social assistance
• social class
• social climber
• social club
• social contract
• social control
• social dancer
• social dancing
• social democracy
• Social Democratic Party
• Social Development Commission
• rope bridge
• rope burn
• rope down
• rope in
• rope ladder