Technical term used in electronics, audio engineering, and control systems to refer to amplification or increase in signal strength.
If you increase the microphone's gain, the sound becomes louder.
If you increase the amplifier's gain, the sound may distort.
The gain of this circuit is 20 decibels.
I lowered the gain to reduce the noise.
You need to adjust the gain before recording.
high-gain
dot gain
income gain; money earned from interest or dividends
Borrowed from English 'gain', used primarily in technical and engineering contexts.