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acoustic having to do with sound or the science of sound, or with the sensation and organs of hearing. [3 definitions]
acoustics (used with a sing. verb) the branch of science dealing with the physics of sound. [2 definitions]
acquaint to introduce, or to make familiar or accustomed to (usu. fol. by "with"). [2 definitions]
acquaintance a person one has met but does not know well. [3 definitions]
acquainted having personal knowledge or familiarity (often fol. by "with").
acquiesce to agree silently or without protest; comply; consent.
acquire to come to possess, esp. gradually over time. [2 definitions]
acquired characteristic a change in the structure or function of a living organism that is caused by environmental factors and may not be transmitted genetically.
acquired immune deficiency syndrome see AIDS.
acquirement the act of acquiring or attaining, esp. by learning. [2 definitions]
acquisition the act or process of acquiring. [2 definitions]
acquisitive having an eager desire to gain or possess, esp. material goods.
acquit to clear (someone) of a charge or accusation, as in a court of law. [3 definitions]
acquittal the act of acquitting, or the fact or condition of being acquitted.
acquittance discharge from a debt or obligation, or a formal notice of this.
acre a unit of area equal to 43,560 square feet or 4,047 square meters, used in measuring land. [2 definitions]
acreage an area or areas of land measured in acres; acres collectively. [2 definitions]
Acremonium The genus of fungi (formerly known as Cephalosporium) from which the antibiotic cephalosporin was originally isolated. Several species may cause disease in humans, esp. pneumonia.
acrid bitter in taste or smell; sharply irritating. [2 definitions]
acrimonious filled with bitterness or rancor.
acrimony bitterness or sharpness in speech or behavior.