gain (Noun) — A quantity that is added. ex. "they recorded the cattle's gain in weight over a period of weeks"
gain (Noun) — The advantageous quality of being beneficial.
gain (Noun) — The amount of increase in signal power, voltage or current expressed as the ratio of output to input.
gain (Noun) — The amount by which the revenue of a business exceeds its cost of operating.
gain (Verb) — Have the benefit of; obtain something desirable. ex. "gain pleasure from one's garden"
gain (Verb) — Acquire something through effort. ex. "Gain an understanding of international finance"
gain (Verb) — Derive a benefit from. ex. "She gained from his vast experience"
gain (Verb) — Be at the destination after some time, either real or abstract; come to a given position.
gain (Verb) — Obtain advantages, such as points, etc.. ex. "The home team was gaining ground"
gain (Verb) — Rise in rate or price. ex. "The stock market gained 24 points today"
gain (Verb) — Increase or develop. ex. "the peace movement gained momentum"
gain (Verb) — Earn on some commercial or business transaction; earn as salary or wages. ex. "He gains $5,000 each month"
gain (Verb) — Increase (one's body weight). ex. "She gained 20 pounds when she stopped exercising"