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acinus one of the small divisions in an aggregate fruit such as a blackberry. [2 definitions]
-acious characterized by; full of or tending toward.
-acity (such) a characteristic, condition, or tendency.
acknowledge to admit or recognize the truth, existence, fact, or validity of. [4 definitions]
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.
acne rosacea a chronic skin condition affecting the face that is characterized by redness, pimples, swelling, and dilation of blood vessels; rosacea.
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, 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.