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r added, by an accession of parts externally; an extraneous addition; as, an accretion of earth. A mineral . . . augments not by grown, but by accretion. Owen. To strip off all the subordinate parts of his as a later accretion. Sir G. C. Lewis.

ing, the state of being accumulated, or that which is accumulated; as, an accumulation of earth, of sand, of evils, of wealth, of honors.

o make familiar by use; to habituate, familiarize, or inure; - - with to. I shall always fear that he who accustoms himself to fraud in little things, wants only opportunity to practice it in greater. Adventurer.

Habituation. Accustomedness to sin hardens the heart. Bp. Pearce.

r. Dryden. To bate an ace, to make the least abatement. [Obs.] -- Within an ace of, very near; on the point of. W. Irving.

An acid pulp in certain fruits, as the pear. Grew.

scent fruit, containing a single seed, as in the buttercup; -- called a naked seed by the earlier botanists. [Written also akene and achænium.]

That aches; continuously painful. See Ache. -- Ach"ing*ly, adv. The aching heart, the aching head. Longfellow.

That variety of either the Bessemer or the open-hearth process in which the converter or hearth is lined with acid, that is, highly siliceous, material. Opposed to basic process.

Relieving weariness; restorative.

An instrument for measuring the acuteness of the sense of hearing. Itard.

The measuring of the power or extent of hearing.

Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory. Acoustic duct, the auditory duct, or external passage of the ear. -- Acoustic telegraph, a telegraph making audible signals; a telephone. -- Acoustic vessels, brazen tubes or vessels, shaped like a bell, used in ancient the…

In relation to sound or to hearing. Tyndall.

r upon conviction; as, to acquiesce in an opinion; to assent to; usually, to concur, not heartily but so far as to forbear opposition.

The thing acquired or gained; an acquirement; a gain; as, learning is an acquisition.

To discharge, as a claim or debt; to clear off; to pay off; to requite. A responsibility that can never be absolutely acquitted. I. Taylor.

The clearing off of debt or obligation; a release or discharge from debt or other liability.

To feign or counterfeit; to simulate. With acted fear the villain thus pursued. Dryden. To act a part, to sustain the part of one of the characters in a play; hence, to simulate; to dissemble. -- To act the part of, to take the character of; to fulfill the duties of.

processes going on in an organism; the performance of a function; as, the action of the heart, the muscles, or the gastric juice.