(mathematics) A vector space whose basis of real numbers has three vectors

(uncountable) The application of science and engineering to the exploration and utilization of outer space / (countable) Any particular scientific or engineering discipline used in this field

(uncountable) Flight into, from or through space. / (countable) A voyage in space.

Alternative spelling of double-spaced

(functional analysis) A normed vector space which is complete with respect to the norm, meaning that Cauchy sequences have well-defined limits that are points in the space.

(mathematics, physics, dynamical system theory) Given a (dynamical) system, any topological space such that every point in the space's underlying set uniquely represents a state of the system and every possible state is represented by some point;

(initially derogatory) A subgenre of speculative fiction or science fiction that emphasizes space travel, romantic adventure, and larger-than-life characters often set against vast exotic settings.

(mathematics, geometry) A space where the principles of Euclidean geometry apply.

(anatomy) A site within the larynx whose lateral border is the thyroid cartilage and posterior (dorsal) border is the pyriform sinus.

(typography) Of a character: combined with another and so not consuming additional horizontal space.