What is "transconductance"

n. (context electronics English) The ratio of the change in output current to the change in input voltage across a circuit

Transconductance (for transfer conductance), also infrequently called mutual conductance, is the electrical characteristic relating the current through the output of a device to the voltage across the input of a device. Conductance is the reciprocal of resistance.

Transadmittance (or transfer admittance) is the AC equivalent of transconductance.