(physics) space / (mathematics) space / area, room

a theory

letter challenging someone to a duel

gender role

(linguistics) "role language": unique language usage serving as a marker of social identity in fictional speech

importance

(geometry) Euclidean distance - the distance between two points defined as the square root of the sum of the squares of the differences between the corresponding coordinates of the points; for example, in two-dimensional Euclidean geometry, the Euclidean distance between two points a = (aₓ, a_y) and b = (bₓ, b_y) is defined as:

a long-distance cross-country skiing race (such as at the Olympics)

(mathematics) pure mathematics

applied mathematics