Gain (?), n. [Cf. W. gan a mortise.] (Arch.) A square or beveled notch cut out of a girder, binding joist, or other timber which supports a floor beam, so as to receive the end of the floor beam.
[1913 Webster]

Gain (gān), n. [OE. gain, gein, ga&yogh_;hen, gain, advantage, Icel. gagn; akin to Sw. gagn, Dan. gavn, cf. Goth. gageigan to gain. The word was prob. influenced by F. gain gain, OF. gaain. Cf. Gain, v. t.] 1. That which is gained, obtained, or acquired, as increase, profit, advantage, or benefit; -- opposed to loss.
[1913 Webster]

But what things were gain to me, those I counted loss for Christ. Phil. iii. 7.
[1913 Webster]

Godliness with contentment is great gain. 1 Tim. vi. 6.
[1913 Webster]

Every one shall share in the gains. Shak.
[1913 Webster]

2. The obtaining or amassing of profit or valuable possessions; acquisition; accumulation. “The lust of gain.” Tennyson.
[1913 Webster]

Gain (?), v. i. To have or receive advantage or profit; to acquire gain; to grow rich; to advance in interest, health, or happiness; to make progress; as, the sick man gains daily.
[1913 Webster]

Thou hast greedily gained of thy neighbors by extortion. Ezek. xxii. 12.
[1913 Webster]

Gaining twist, in rifled firearms, a twist of the grooves, which increases regularly from the breech to the muzzle. To gain on or To gain upon. (a) To encroach on; as, the ocean gains on the land. (b) To obtain influence with. (c) To win ground upon; to move faster than, as in a race or contest. (d) To get the better of; to have the advantage of.
[1913 Webster]
The English have not only gained upon the Venetians in the Levant, but have their cloth in Venice itself. Addison.
[1913 Webster]

My good behavior had so far gained on the emperor, that I began to conceive hopes of liberty. Swift.
[1913 Webster]