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

• brachyurous
• bracing
• bracken
• bracket
• bracket creep
• bracket fungus
• bracket out
• bracketed blenny
• brackish
• brackishness
• bract
• bracteal
• bracteate
• bracted
• bracteolate
• bracteole
• bractlet
• brad
• bradawl
• Bradbury
• Bradford
• Bradley
• Bradley method
• Bradley method of childbirth
• Bradley's spleenwort