(geometry) A non-Euclidean geometry in which the distance between two points is the sum of the absolute differences between their corresponding coordinates.

A full moon in August.

The part of a tournament in which every player or team competes against each of the others in turn. / A petition signed in a circular fashion to disguise the order in which it was done.

(historical) An in-kind tribute in Imperial Russia exacted from the indigenous peoples of Siberia, usually in fur.