To have or receive advantage or profit; to acquire gain; to grow rich; to advance in interest, health, or happiness; to make progress.
The sick man gains daily.
3
To come off winner or victor in; to be successful in; to obtain by competition.
to gain a battle; to gain a case at law
4
To increase.
noun
1
A square or bevelled 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.