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atomicity the number of atoms in a molecule. [2 definitions]
atomic mass unit a unit equal to one twelfth of the mass of an atom of the most abundant kind of carbon, equal to 1.6605 times 1024 gram.
atomic number the number of protons or positive electrical charges in the nucleus of one atom of a given element. [2 definitions]
atomic pile see "nuclear reactor."
atomic theory any of several theories concerning the structure, properties, or behavior of atoms. [2 definitions]
atomic weight the average weight of one atom of a given element, expressed in atomic mass units.
atomism a theory that all matter is composed of small, indivisible particles called atoms, which in modern form is called atomic theory. [2 definitions]
atomistic of or relating to atoms or atomism. [2 definitions]
atomize to divide into atoms. [3 definitions]
atomizer a device that converts a liquid, esp. a medicine or perfume, into a spray.
atom smasher see "accelerator."
atonal in music, composed without a fixed key or scale.
at once at the same time. [2 definitions]
atone to make reparation for a sin, crime, error, or the like (usu. fol. by "for"). [2 definitions]
at one in a state of harmony or accord.
atonement the act of atoning; reparation. [3 definitions]
at one's elbow close by.
at one's fingertips readily available.
at one's heels in close pursuit.
at one's leisure when the time is convenient; when one has spare time.
atop at or on the highest point. [2 definitions]