A theory according to which society is based on conflict and change arising from inequality.

(pathology) is described as a free-floating mass, located inside blood vessels that can travel from one site in the blood stream to another. An embolus can be made up of solid (like a blood clot), liquid (like amniotic fluid), or gas (like air).

(geometry) A convex quadrilateral in which each pair of opposite edges are parallel and of equal length.

A device that accelerates electrically charged particles to extremely high speeds, for the purpose of inducing high energy reactions or producing high energy radiation.

(geometry) The conic section formed by the intersection of a cone with a plane parallel to a tangent plane to the cone; the locus of points equidistant from a fixed point (the focus) and line (the directrix).

(physics) The concept applying to all matter and radiation, but most evident in light and particles such as the electron, that properties of waves and of particles are exhibited simultaneously

(physics) A positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity; α-particle

The obsolete name for a psychotic disorder, now called delusional disorder, often (in one of 6 subtypes) characterized by delusions of persecution and perceived threat against the individual affected with the disorder, and often associated with false accusations and general mistrust of others

(programming) A value supplied to a method or function, as opposed to a formal parameter.

(programming) An abstract representation, typically including a name and a type, of a parameter expected to be passed to a method or function.