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acknowledgment the act of acknowledging, or the fact of being acknowledged. [2 definitions]
ACLU abbreviation of "American Civil Liberties Union," an organization that works to defend and preserve the civil rights of citizens in the United States.
acme the highest point, as of attainment; pinnacle.
acne a skin disorder caused by inflammation of the oil glands, resulting in pimples, usu. on the face.
acolyte a person who assists a clergyman in religious services, esp. Roman Catholic. [2 definitions]
aconite a plant of the buttercup family, that has poisonous and medicinal properties; monkshood. [2 definitions]
acorn the fruit of the oak tree, having a smooth, ovoid nut partially enclosed by a rough, cuplike base.
acorn squash a variety of winter squash with a ridged acorn shape and dark green skin.
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; 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]