(physics) A law that equates the angle (𝜃) between the incident and scattered ray to the spacing (d) between the crystal planes and the wavelength (𝜆) of the radiation - n𝜆=2d sin (𝜃),

(physics) the principle that the stress applied to a solid is directly proportional to the strain produced. This law describes the behavior of springs and solids stressed within their elastic limit.

Alternative form of Hubble law

(astronomy) A law stating that the velocity at which a distant object is receding from the Earth (as measured by its redshift) is proportional to its distance; observational evidence for an expanding universe.

A female friend (used to avoid the possible ambiguity of the term girlfriend) / (euphemistic) A quainter term for girlfriend, often used ironically.

(physics) the equation of state of an ideal gas

Of or pertaining to common law. / Relating to common-law marriage.

A light bulb whose metallic filament is heated by an electric current.

(law) Law developed by judges, courts, and agency adjudicatory tribunals, through their decisions and opinions (also called case law) (as opposed to statutes promulgated by legislatures, and regulations promulgated by the executive branch).

A marriage based on the duration of cohabitation rather than formal ceremony.