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

• prophyll
• propinquity
• propionaldehyde
• propionic acid
• propitiate
• propitiation
• propitiative
• propitiator
• propitiatory
• propitious
• propitiously
• propitiousness
• propjet
• propman
• proponent
• proportion
• proportionable
• proportionably
• proportional
• proportional counter
• proportional counter tube
• proportional font
• proportional representation
• proportional sample
• proportional sampling