(physics) A function which is a solution of Schrödinger's wave equation; the psi function

(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 sheet of birefringent material whose thickness is such that the light associated with the larger refractive index is retarded in phase by 90° with respect of that associated with the smaller refractive index; used to convert linearly polarized light into circularly polarized light

(physics) A function of the position and spin of an electron; related to the probability of finding the electron in a specified position

(physics) The low-energy, ground state of a metal in which densities of the electron spins and charges follow a regular spatial distribution

(electronics) An electron tube in which high-energy microwaves are produced by transferring energy from electrons

(physics) A three-dimensional partial differential equation which determines the evolution of a quantum mechanical wave function

The original period of concerted feminist activity during the 19th and early 20th century, focusing on de jure gender inequalities, primarily that of suffrage (the right to vote).

A period of feminist activity that began in the early 1990s as a response to perceived failures of second-wave initiatives to address the needs of women of many races, ethnicities, nationalities, religions and cultural backgrounds.

A period of feminist activity that began in the early 1960s in the United States and broadened the gender equality debate to include family, the workplace, reproductive rights, etc.