(letterpress typography) A piece of metal type used to create the narrowest space. / (typography, US) The narrowest space appearing between letters and punctuation.

To type (or format) text without leaving a blank line between each line of text. / To type (or format) text with only one space between consecutive sentences.

A broad step between flights of a staircase. / (mathematics) Either of the two parts of three-dimensional space divided by a plane.

(mathematics) A Riemann space in which the contracted curvature tensor is proportional to the metric tensor

(astronomy) That part of outer space between the planets of a solar system and its star

(mathematics) Either of two spaces between which an isometry exists

(mathematics) Any metric space whose elements are functions

(anatomy) Any of the spaces between the placental villi that contain maternal blood

That part of an optical system where real or virtual images are formed

The vector product of the translational and angular displacements of each joint of a robotic link; all the places that a robotic arm can access. / (anatomy) The space in a joint between two bones.