1. Capacity or power to produce a desired effect
   "concern about the safety and efficacy of the vaccine"
   - efficaciousness

Derived forms: efficacies

See also: efficacious, inefficacious

Type of: effectiveness, effectivity, effectuality, effectualness

Antonym: inefficacy

Encyclopedia: Efficacy

• semiconscious
• semiconsciousness
• semidark
• semidarkness
• semidesert
• semidetached
• semidiameter
• semiempirical
• semiepiphyte
• semifinal
• semifinalist
• semifluid
• semifluidity
• semiformal
• semigloss
• semihard
• semiliquid
• semiliterate
• semilunar
• semilunar bone
• semilunar cartilage
• semilunar valve
• semimajor axis
• semiminor axis
• semimonthly