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The state or quality of being accurate; accuracy; exactness; nicety; precision.

Hence: A very small quantity or degree; a particle; an atom; a jot. I 'll not wag an ace further. Dryden. To bate an ace, to make the least abatement. [Obs.] -- Within an ace of, very near; on the point of. W. Irving.

The quality of being acescent; the process of acetous fermentation; a moderate degree of sourness. Johnson.

The quality of being acetous; sourness.

The state or quality of being achromatic; as, the achromatism of a lens; achromaticity. Nichol.

The quality of being sour; sourness; tartness; sharpness to the taste; as, the acidity of lemon juice.

Having an acid quality; sour; acidulous. "With anxious, acidulent face." Carlyle.

, as the pancreas; also, one of the saccular recesses in the lobules of a racemose gland. Quain.

alances itself horizontally, having no dip. The aclinic line is also termed the magnetic equator. Prof. August.

An isolated point not upon a curve, but whose coördinates satisfy the equation of the curve so that it is considered as belonging to the curve.

The quality of being acquiescent; acquiescence.

The quality of being acquirable; attainableness. [R.] Paley.

The quality of being acquisitive; propensity to acquire property; desire of possession.

A piece of land, containing 160 square rods, or 4,840 square yards, or 43,560 square feet. This is the English statute acre. That of the United States is the same. The Scotch acre was about 1.26 of the English, and the Irish 1.62 of the English.

The quality of being acrid or pungent; irritant bitterness; acrimony; as, the acridity of a plant, of a speech.

The quality of being acrimonious; asperity; acrimony.

A quality of bodies which corrodes or destroys others; also, a harsh or biting sharpness; as, the acrimony of the juices of certain plants. [Archaic] Bacon.

to serve as. -- To act on, to regulate one's conduct according to. -- To act up to, to equal in action; to fulfill in practice; as, he has acted up to his engagement or his advantages.

pianoforte or to the valve of an organ pipe. Grove. Chose in action. (Law) See Chose. -- Quantity of action (Physics), the product of the mass of a body by the space it runs through, and its velocity.

Having the power or quality of acting; causing change; communicating action or motion; acting; -- opposed to Ant: passive, that receives; as, certain active principles; the powers of the mind.