Technical term used in electronics, audio engineering, and control systems to refer to amplification or increase in signal strength.
アンプのゲインを上げると音が歪むことがある。
If you increase the amplifier's gain, the sound may distort.
If you increase the microphone's gain, the sound becomes louder.
The gain of this circuit is 20 decibels.
ノイズを抑えるためにゲインを下げた。
I lowered the gain to reduce the noise.
You need to adjust the gain before recording.
capital gain
high-gain
dot gain
income gain; money earned from interest or dividends
Borrowed from English 'gain', used primarily in technical and engineering contexts.