(astronomy) Electromagnetic waves with a wavelength less than one millimeter (the band begins at about 0.3 THz). A term often used by radio astronomers.

plural of hybrid wave function

plural of electron wave function

(US politics, slang) To mention martyrs and wars (especially the American Civil War) in an effort to draw empathy.

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.

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.

(in military combat) To indicate to an opposing force that one is surrendering. / (figuratively) To yield, give up, or quit.

(oceanographics, nautical) A standardized measure of trough-to-crest wave height calculated for the needs of seafarers; exact mathematical definition has varied over time and currently it is defined as four times the standard deviation of the surface elevation.

Alternative form of travelling-wave tube