The noun gain has 4 senses (first 4 from tagged texts)
1. (7) addition, increase, gain -- (a quantity that is added; "there was an addition to property taxes this year"; "they recorded the cattle's gain in weight over a period of weeks")
2. (2) profit, gain -- (the advantageous quality of being beneficial)
3. (2) amplification, gain -- (the amount of increase in signal power or voltage or current expressed as the ratio of output to input)
4. (1) gain -- (the amount by which the revenue of a business exceeds its cost of operating)
Overview of verb gain
The verb gain has 9 senses (first 8 from tagged texts)
1. (30) derive, gain -- (obtain; "derive pleasure from one's garden")
2. (13) acquire, win, gain -- (win something through one's efforts; "I acquired a passing knowledge of Chinese"; "Gain an understanding of international finance")
3. (7) profit, gain, benefit -- (derive a benefit from; "She profited from his vast experience")
4. (5) reach, make, attain, hit, arrive at, gain -- (reach a destination, either real or abstract; "We hit Detroit by noon"; "The water reached the doorstep"; "We barely made it to the finish line"; "I have to hit the MAC machine before the weekend starts")
5. (2) gain, advance, win, pull ahead, make headway, get ahead, gain ground -- (obtain advantages, such as points, etc.; "The home team was gaining ground"; "After defeating the Knicks, the Blazers pulled ahead of the Lakers in the battle for the number-one playoff berth in the Western Conference")
6. (2) advance, gain -- (rise in rate or price; "The stock market gained 24 points today")
7. (2) gain -- (increase in; "gain momentum"; "gain nerve")
8. (1) gain, take in, clear, make, earn, realize, realise, pull in, bring in -- (earn on some commercial or business transaction; earn as salary or wages; "How much do you make a month in your new job?"; "She earns a lot in her new job"; "this merger brought in lots of money"; "He clears $5,000 each month")
9. gain, put on -- (increase (one's body weight); "She gained 20 pounds when she stopped exercising")