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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; obtain. [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]
acrid bitter in taste or smell; sharply irritating. [2 definitions]
acrimonious filled with bitterness or rancor.
acrimony bitterness or sharpness in speech or behavior.
acro- top; peak; height. [2 definitions]
acrobat a person who performs feats of balance and physical dexterity.