(medicine) The ratio (MRD + MLD) / ID, where MRD is the greatest perpendicular diameter from midline to right heart border; MLD is the greatest perpendicular diameter from midline to left heart border; and ID is the internal diameter of the chest at the level of the right hemidiaphragm.

(mathematics) The ratio of each term of a geometric progression to the term preceding it.

Alternative form of S/F ratio

Alternative form of P/F ratio

In radioactivity, the portion of all decays that take a given pathway. For example, californium-252 decays by alpha decay ~97% of the time, and by spontaneous fission ~3% of the time; so the branching ratio is about 0.97 in favor of alpha decay, and about 0.03 in favor spontaneous fission.

(finance) Alternative form of PE ratio

(cinematography) An aspect ratio in which a motion picture is formatted to fit a specific type of screen (historically 1.33:1), as opposed to original aspect ratio.

(cinematography) The aspect ratio of the rectangular shape that the director intended his or her motion picture to be viewed in, as opposed to modified aspect ratio.

(India, finance) The proportion of loan-assets created by banks from the deposits received.

(sciences) A figure of merit comparing the strength of a signal carrying information to the noise interfering with it.