1. The minimum input signal required to produce a specified output signal, for a radio receiver or similar device.

2. Of a camera tube, the signal current developed per unit incident radiation, that is, per watt per unit area.

1. A measure of the ease with which a substance can be caused to explode.

2. A measure of the effect of a change in severity of engine- operating conditions on the antiknock performance of a fuel; expressed as the difference between research and motor octane numbers. Also known as spread.

The effect of remolding on the consistency of a clay or cohesive soil, regardless of the physical nature of the causes of the change.

The capacity for receiving sensory impressions from the environment.

1. The ability of the output of a device, system, or organism to respond to an input stimulus.

2. Mathematically, the ratio of the response or change induced in the output to a stimulus or change in the input.