(harmonic analysis, representation theory, topology) A branch of harmonic analysis dealing with generalised Fourier transforms that act on functions defined on Hausdorff locally compact topological groups.

plural of absorption line

(physics) The characteristic pattern of dark lines or bands that occurs when electromagnetic radiation is passed through an absorbing medium into a spectroscope.

Any of several methods of allowing people to vote without attending an official voting station

(semantics) The condition of a sign which has an empty, absent, non-existent, paradoxical, hypothetical, supernatural, or undefined referent, such as nothing, null, vacuum, or void.

(dated, before 1968) The unit of temperature, the kelvin.

plural of absence seizure

plural of absentee ballot

plural of absolute error

plural of absolute complement