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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]
acute accent a diacritical mark (), placed over a vowel to indicate length or high pitch, or to indicate primary stress of a syllable. (Cf. grave accent.)
acute angle an angle of less than ninety degrees.
-acy characteristic, condition, position, or the like.
acyclovir an antiviral drug used in the treatment of herpes simplex viral infections, chickenpox, and shingles.
A.D. abbreviation of "anno Domini" (Latin); in the year of the Lord, or, since the birth of Jesus Christ (used in designating dates).
ad advertisement. [2 definitions]
ad- to; toward. [2 definitions]