A surname originating as an occupation.

(sewing) A sewing machine of the Singer brand. / A former make of British motor car.

(mathematics) Of a function, associating a unique value of its range with each value of its domain.

(medicine) Pneumonia affecting one lung.

A component in a device, or a point in a network, that, if it were to fail would cause the entire device or network to fail; normally eliminated by adding redundancy.

(playing cards) A playing card that is the only one of its suit in a hand, especially at bridge. / (playing cards) A hand containing only one card of a certain suit.

The unified currency proposed for all EU states; it became the Euro.

A line or queue one person wide.

(of a line or queue) One person wide.

In a line or queue one person wide.