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activist one who advocates a cause with vigor or militance.
activity the condition or state of being active. [4 definitions]
act of God in law, a sudden unforeseen event, esp. a natural disaster such as an earthquake, flood, or tornado, that is caused entirely by forces of nature and could not have been prevented.
actor one who plays roles in dramatic productions on stage, in films, or on radio and television. [2 definitions]
actress a woman or girl who plays roles in dramatic productions.
Acts see Acts of the Apostles.
Acts of the Apostles the fifth book of the New Testament, believed to have been written by Luke, that describes the work of Jesus Christ as it was carried on after his death by his apostles.
actual truly existing or happening, not just potentially or in the imagination. [3 definitions]
actuality the state or fact of truly or currently existing; reality. [2 definitions]
actualize to make real; to give substance to.
actually as a matter of fact; really. [2 definitions]
actuary a person who calculates insurance rates, risks, and dividends on the basis of statistical probabilities.
actuate to put into action or set in motion; cause to operate. [2 definitions]
act up to behave in a bad or mischievous way; misbehave. [3 definitions]
acuity sharpness or keenness, as of sense perception or understanding.
acumen superior insight; quickness and shrewdness of judgment, esp. in practical matters.
acuminate tapering to a sharp point, as a leaf or claw; pointed. [2 definitions]
acupressure a process or technique intended to relieve pain or cure disease by the application of pressure with the hands to specific parts of the body. [2 definitions]
acupuncture a traditional Chinese practice of pricking certain parts of the body with fine needles to relieve pain or cure disease. [2 definitions]
acupuncturist a person, esp. a physician, chiropractor, or healthcare professional, who practices acupuncture.
acute of great severity or intensity. [7 definitions]