Dissipate and separate both move things apart, but end very differently. Dissipate is to scatter and gradually fade until nothing is left. Separate is to move or keep things apart, or to be distinct — the things remaining. Dissipate ends in nothing; separate leaves things apart but intact.
Both put things apart, but dissipate loses the thing and separate keeps the parts. Dissipate, from dis- 'apart' and supare 'to throw', thins something out until it is gone. Separate, from Latin separare 'to part', moves things away from each other or keeps them distinct, all still there. A mist dissipates and is gone; two magnets are separated and each remains. One fades to nothing; the other leaves distinct pieces.
dissipate
To dissipate is to scatter and fade until nothing is left: fog dissipates as the sun climbs, tension dissipates after an argument, energy dissipates as heat. Unlike disperse, where a thing spreads out but still exists somewhere, what dissipates loses itself completely — it thins into the air and is gone. From the Latin dissipare, 'to scatter', it can also mean to squander: a fortune may dissipate as surely as mist. Either way, something concentrated ends as nothing.
separate
To separate is to move things apart or to keep them apart — you separate two fighters, separate the yolk from the white, separate a class into groups. From the Latin separare, 'to disjoin'. Where you divide a whole into parts, to separate more often pulls already-distinct things away from each other, or sorts a mixture. As an adjective — and pronounced differently — separate means distinct or unconnected: three separate rooms, a separate issue. It is the quiet opposite of join.
| dissipate | separate | |
|---|---|---|
| Meaning | scatter and fade away to nothing | move or keep apart; be distinct |
| What is left | nothing | the things, now apart but intact |
| Manner | gradual thinning to nothing | deliberate parting or keeping apart |
| Often with | fog, heat, energy, tension | items, groups, the yolk, the sexes |
| Noun | dissipation | separation |
| Example | The mist dissipated. | Separate the two piles. |
Ask whether the thing vanishes or the parts remain apart. Dissipate thins a thing out until nothing remains — a fog lifting off the hills. Separate moves things apart, or keeps them distinct, but each remains — two magnets drawn to their own sides. If a thing fades to nothing, that is dissipate; if things are parted but stay intact, they are separate.
dissipate
- iThe tension in the room dissipated once she laughed.
- iiBy noon the fog had completely dissipated.
- iiiHis early energy slowly dissipated over the evening.
separate
- iSeparate the ripe fruit from the unripe before packing.
- iiThe two schools were kept separate for another decade.
- iiiSeparate the yolks from the whites.
Both involve things coming apart, but dissipate ends in nothing while separate leaves the parts intact and distinct. You separate the yolks from the whites (both remain); the fog dissipates (nothing remains). The tell is what is left — nothing versus distinct pieces. Watch separate's spelling — an 'a' in the middle.
A useful pair once the outcome is clear. Dissipate is for something fading to nothing — 'the tension dissipated', 'the fog dissipated'. Separate is for parting things that remain — 'separate the waste', 'kept separate'. Examiners reward the tell: nothing left (dissipate) versus distinct parts remaining (separate), plus the spelling trap in separate (an 'a' in the middle). The nouns are dissipation and separation.