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effectiveness the quality or condition of working as intended or of having the desired result.
effector a cell or an organ such as a muscle or gland that responds to a nerve impulse.
effectual causing or capable of causing a desired result; effective; efficacious. [2 definitions]
effectuate to cause to happen; put into effect.
effeminate of a man or boy, having qualities of appearance, manner, or behavior conventionally associated with feminine rather than masculine gender; unmanly.
effendi a Turkish title of respect meaning "sir" or "mister".
efferent in physiology, carrying or directing away from an organ. (Cf. afferent.) [2 definitions]
effervesce of a liquid, to emit tiny bubbles, hiss, and foam as gas is released. [2 definitions]
effervescence the fizzing or bubbling in a liquid that emits tiny popping gas bubbles, often as a result of fermentation or carbonation. [2 definitions]
effervescent emitting tiny gas bubbles; foaming; bubbly. [2 definitions]
effete lacking healthy vigor or effectiveness; worn out. [2 definitions]
efficacious causing or capable of causing a desired result; effectual; effective.
efficacy the ability to produce desired results; effectiveness.
efficiency the state of being efficient. [3 definitions]
efficiency apartment a small, sometimes furnished apartment usu. containing one large room with a kitchenette and an attached bathroom.
efficient operating or performing in an effective and competent manner, with little waste of effort or resources. [2 definitions]
effigy a likeness of a person, usu. sculpted, as on a tomb. [2 definitions]
effloresce to flower vigorously; bloom. [2 definitions]
efflorescence the condition, time, or process of blooming or flowering. [5 definitions]
effluence the act or process of flowing out. [2 definitions]
effluent flowing forth. [3 definitions]