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coincide vs concentrate

Coincide and concentrate are only loosely related and rarely interchangeable. Coincide is for two independent things to occupy the same point or happen at the same time, often by chance. Concentrate is to bring things together in one place, to make something denser, or to focus attention. Coincide has two things share a point; concentrate draws many things to a centre.

Quick rule
two independent things share the same point or time→coincide
gather things to a centre to intensify, thicken or focus→concentrate
coincide

Fig. 1a — coincide.

/ˌkoʊɪnˈsaɪd//ˌkəʊɪnˈsaɪd/·verb
vs
concentrate

Fig. 1b — concentrate.

/ˈkɑːnsntreɪt//ˈkɒnsntreɪt/·verb, noun

Both involve a point, but in different ways. Coincide, from co- 'together' and incidere 'to fall upon', means two things fall on the same spot or moment while staying separate — two dates that happen to land together. Concentrate, from com- 'together' and centrum 'centre', draws scattered things to one central point, packs a substance denser, or gathers the mind on one task. Two events coincide; sunlight is concentrated to a burning point through a lens. One notes a shared point between two things; the other gathers many to a centre.

01What each means

coincide

To coincide is to occupy the same point — in time, space, or opinion — while belonging to different paths. From the Latin co-incidere, 'to fall upon together'. Festivals coincide with full moons; an interview coincides with a strike; two rivals' interests briefly coincide. The word insists on independence: neither schedule bent for the other, which is exactly what makes coincidence feel like fate — two orbits, each obeying only itself, agreeing on a single moment.

concentrate

To concentrate is to gather toward one centre until it is strong — from the Latin com- 'together' and centrum 'centre'. Scattered forces concentrate at a border; a reader concentrates on a page, pulling stray attention to one point; boiling concentrates a juice by driving off its water. As a noun, a concentrate is what is left when the water is gone: the same substance, no longer spread thin. To consolidate holdings is close, but concentrate keeps the sense of intensity growing as things gather.

02At a glance
coincideconcentrate
Meaningoccupy the same point or timegather to one point; make denser; focus
The pointtwo things share it, still separatemany things are drawn to it
Registerneutral, often formal or technicalneutral, everyday to technical
Often withdates, events, lines, opinionsattention, power, forces, a solution
Nouncoincidenceconcentration
ExampleThe dates coincide.Concentrate the light.
03How to remember

Ask whether two things share a point, or many are drawn to one. Coincide leaves two things separate, meeting only at a shared point or moment — two rings crossing at one spot. Concentrate draws scattered things to a centre to intensify them — light pulled to a burning dot through a lens. If two independent things share the same point, they coincide; if things are gathered to a centre, that is concentrate.

04In use

coincide

  • iHer visit happened to coincide with the festival.
  • iiThe two lines coincide at exactly one point.
  • iiiOur views on the matter largely coincide.

concentrate

  • iThe lens concentrates the sunlight into a single hot point.
  • iiTry to concentrate on one task at a time.
  • iiiWealth became concentrated in a few hands.

These are not true synonyms. Coincide is about two things happening to share a point or moment, often by chance, and is intransitive; concentrate is about drawing many things to a centre, thickening a substance, or focusing the mind, and is usually transitive. They touch only in the loose idea of 'a point', but coincide notes a meeting while concentrate performs a gathering.

05Asked
What is the difference between coincide and concentrate?
Coincide is for two independent things to occupy the same point or happen at the same time, often by chance, while concentrate is to bring things together in one place, make something denser, or focus attention. Coincide has two things share a point; concentrate draws many things to a centre. In the scenes above, two rings merely cross at one shared point, whereas a lens pulls wide light to a single point until it burns.
Are coincide and concentrate synonyms?
Only very loosely. Both involve a point, but coincide notes two separate things happening to share one, while concentrate gathers many things to a centre or focuses the mind. You could never swap them — 'the dates concentrated' or 'coincide your attention' would both be wrong. Treat them as related only by the vague idea of a point, and otherwise distinct.
What does coincide mean when opinions coincide?
It means they agree — 'our views coincide' is a formal way of saying we think the same, while staying two separate views, like the rings meeting at one point in the scene above. Concentrate has no such sense; to 'concentrate' opinions would mean gathering many of them densely, not two happening to match. So coincide notes agreement, concentrate a gathering or focusing.
What does concentrate mean when you concentrate on something?
It means to give it your full attention, gathering your thoughts on one thing and shutting others out — 'concentrate on the question'. The image matches the lens in the scene above: scattered focus pulled to a single point becomes powerful. Coincide has no mental sense; it stays with two things sharing a point or moment, often by chance.
What are the noun forms of coincide and concentrate?
Coincidence and concentration. 'A coincidence' usually names a chance meeting of events; 'concentration' names a gathering into one place, focused attention, or the strength of a solution. The nouns keep the verbs apart: one marks a shared point between things, the other a gathering or focusing that makes something denser or more intense.
How do you pronounce coincide and concentrate?
Coincide is koh-in-SIDE (/ˌkoʊɪnˈsaɪd/), stressed on the last syllable, sounding like 'side'. Concentrate is KON-sen-trayt (/ˈkɒnsntreɪt/ in UK, /ˈkɑːn-/ in US), stressed on the first. Their nouns are coincidence and concentration. The two are easy to tell apart in speech, which helps keep their quite different meanings distinct.
Which word describes two events on the same day?
Coincide. Two events on the same day coincide — they share a moment while staying separate events, like the rings meeting at one point in the scene above. You would only use concentrate if you meant gathering many events densely into one period. The tell is number and action: coincide notes two things sharing a point, concentrate gathers many to a centre.
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coincide — full entryconcentrate — full entry← All synonyms