(relativity) A symmetric 4 × 4 tensor equation in general relativity in which the gravitational force is described as a curvature of spacetime caused by matter and energy.

(US, education) The period in school that comes after seventh grade and before ninth grade.

The period of time consisting of the years 1800 through 1899.

A group of eight persons or things.

Ba Duan Jin, a Chinese exercise.

(physics) A type of wormhole that is inherently unstable and collapses before any information or matter can pass through.

Alternative spelling of 18-wheeler.

Initialism of editor in chief.

(attributive) in the shape of an 8 (eight)

alternative form of figure of eight