Dissolve and merge are near-opposites for a body or substance. Dissolve is for a solid to break down and disappear into a liquid, or for a group to be formally ended. Merge is for separate things to combine into a single whole. Dissolve breaks a thing down or ends it; merge joins things into one.
They point in opposite directions. Dissolve, from Latin dissolvere 'to loosen apart', breaks a solid down until it vanishes, or winds up an organization (a parliament is dissolved). Merge, from mergere 'to plunge', combines separate things into one lasting body. A company is dissolved and gone; two companies merge into one. One is a breaking-down or ending; the other a joining.
dissolve
To dissolve is for a solid to break apart into a liquid until it disappears into it — sugar dissolves in water — or, by extension, for something to fade out or be formally ended (a marriage, a company, a parliament is dissolved). From the Latin dissolvere, 'to loosen apart', from solvere 'to loosen', the root of solve and solvent. A substance dissolves when its particles separate and spread evenly through the liquid — the reverse of what happens when droplets coalesce. Governments dissolve; tension dissolves; a crowd can dissolve into laughter.
merge
To merge is for two separate things to come together into one — lanes of traffic merge, companies merge, datasets merge. From the Latin mergere 'to plunge or dip', it once meant to sink in, and still carries that sense of one thing taken into another until they are no longer separate. When two firms merge they form a single company; where two rivers merge, one name usually wins. To merge is a broader, often deliberate move than to coalesce, and a close relative of consolidate.
| dissolve | merge | |
|---|---|---|
| Meaning | break down into liquid; be ended | combine into a single whole |
| Outcome | the thing is gone or wound up | one combined thing remains |
| Acts on | a solid, or an organization | separate things joined |
| Often with | sugar, salt, parliament, a firm | companies, lanes, files |
| Noun | dissolution | a merger / merging |
| Example | The salt dissolves in water. | The two lanes merge ahead. |
Ask whether the thing survives. Dissolve breaks it down until it is gone, or ends a body outright — the sugar disappears into the water. Merge keeps everything and joins it into one lasting whole — two lanes become a single line. If it breaks down or is ended, that is dissolve; if separate things combine, that is merge.
dissolve
- iStir until the sugar dissolves completely.
- iiParliament was dissolved before the election.
- iiiThe partnership was dissolved after ten years.
merge
- iThe two firms merged into a single company.
- iiThe rivers merge below the falls.
- iiiMerge the two files into one document.
Dissolve breaks a thing down or winds it up; merge combines separate things into one. For an organization they are opposites — a dissolved company ceases to exist, while a merged one lives on inside the new whole.