(music) The position when the thumb is contacting the string or strings of a stringed instrument.

(physics) A feedback loop in which the output of a system is amplified with a net positive gain and added to the input signal before the main amplifier.

A position in which a person sits upright in a bed, possibly bending forward.

(bacteriology, of a bacterium) That stains dark blue or violet after Gram staining, due to large quantities of peptidoglycan in the cell wall.

plural of position paper

A glowing region in a glow discharge between the Faraday dark space and the anode glow.

plural of positive column

(game theory) Pertaining to a game or situation where overall benefits to all participants can increase.

(dated) Gothic rock.

plural of juxta-position