Functioning and Efficacious

noun

• Process or manner of functioning or operating.
  • usage: "the power of its engine determines its operation"; "the plane's operation in high winds"; "they compared the cooking performance of each oven"; "the jet's performance conformed to high standards"
  • synonyms: operation, performance

verb

• Perform as expected when applied.
  • usage: "The washing machine won't go unless it's plugged in"; "Does this old car still run well"; "This old radio doesn't work anymore"
  • synonyms: function, work, operate, go, run
• Serve a purpose, role, or function.
  • usage: "The tree stump serves as a table"; "The female students served as a control group"; "This table would serve very well"; "His freedom served him well"; "The table functions as a desk"
  • synonyms: serve, function
• Perform duties attached to a particular office or place or function.
  • usage: "His wife officiated as his private secretary"
  • synonyms: officiate, function

adjective

• Performing or able to perform its regular function.
  • usage: "a functioning flashlight"

adjective

• Marked by qualities giving the power to produce an intended effect.
  • usage: "written propaganda is less efficacious than the habits and prejudices... Of the readers-Aldous Huxley; "the medicine is efficacious in stopping a cough"
• Producing or capable of producing an intended result or having a striking effect.
  • usage: "an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation-LewisMumford; "effective teaching methods"; "effective steps toward peace"; "made an effective entrance"; "his complaint proved to be effectual in bringing action"; "an efficacious law"
  • synonyms: effective, effectual

(n.) Possessing the quality of being effective; productive of or powerful to produce, the effect intended; as, an efficacious law.