to mix a solid with a liquid until it becomes part of the liquid

घुलना

English Usage: You should dissolve the sugar in the water before drinking it.

Hindi Usage: आपको पानी में चीनी घुलानी चाहिए।

the act of dissolving something

विलय

English Usage: The dissolution of the partnership was unexpected.

Hindi Usage: साझेदारी का विलय अप्रत्याशित था।