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concentrate vs intersect

Concentrate and intersect are only loosely related and rarely interchangeable. Concentrate is to draw scattered things to one central point, to make something denser, or to focus. Intersect is to cross at a point and continue past it, or to have a point or area in common. Concentrate gathers many to a centre; intersect only has two things share a crossing point.

Quick rule
gather many things to one point, making them denser→concentrate
have two paths cross at a shared point and continue→intersect
concentrate

Fig. 1a — concentrate.

/ˈkɑːnsntreɪt//ˈkɒnsntreɪt/·verb, noun
vs
intersect

Fig. 1b — intersect.

/ˌɪntərˈsekt//ˌɪntəˈsekt/·verb

Both involve a point, but in very different ways. Concentrate, from centrum 'centre', gathers scattered things to a central point or packs a substance denser. Intersect, from inter- 'between' and secare 'to cut', means two things cross and share a point, then continue on their own paths — two roads, two lines. Forces are concentrated at one point; two roads intersect and run on. One masses many to a centre; the other marks where two paths cross.

01What each means

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.

intersect

To intersect is for two lines, roads, or paths to cross each other at a point and carry on past it — from the Latin inter- 'between' and secare 'to cut', literally to cut between. Where roads intersect there is a junction; where two sets intersect there are the members they share. The word runs figuratively too: two fields of study intersect where their concerns overlap. Unlike paths that meet and stop, intersecting lines cross and keep going, then diverge again beyond the point.

02At a glance
concentrateintersect
Meaninggather to one point; make densercross at a point and continue
At the pointmany things massed and intensifiedtwo paths cross, then part
Registerneutral, everyday to technicalneutral, often geometric or technical
Often withattention, power, forces, a solutionroads, lines, sets, disciplines
Nounconcentrationintersection
ExampleConcentrate the forces.The roads intersect.
03How to remember

Ask whether many gather to a point, or two paths cross one. Concentrate masses scattered things at a centre and intensifies them — light pulled to a burning dot. Intersect just marks where two paths cross before each carries on — two roads at a junction. If things gather to a point and pack tight, that is concentrate; if two paths cross at a shared point, they intersect.

04In use

concentrate

  • iThe general concentrated his forces at the bridge.
  • iiThe lens concentrates the light onto one spot.
  • iiiTry to concentrate on one task at a time.

intersect

  • iThe two roads intersect at the edge of town.
  • iiTheir research interests intersect at climate policy.
  • iiiThe line intersects the circle at two points.

These are not true synonyms. Concentrate gathers many things to a centre and intensifies them; intersect merely marks where two things cross, each continuing on. They touch only in the idea of 'a point', but concentrate performs a massing while intersect notes a crossing. One is about density; the other about a shared location.

05Asked
What is the difference between concentrate and intersect?
Concentrate is to draw scattered things to one central point, make something denser, or focus, while intersect is to cross at a point and continue past it, or to have a point in common. Concentrate gathers many to a centre; intersect only has two things share a crossing point. In the scenes above, a lens masses wide light to a single burning point, while two roads merely cross at a junction and each drives on.
Are concentrate and intersect synonyms?
Only very loosely. Both involve a point, but concentrate masses many things at a centre and intensifies them, while intersect notes where two paths cross before parting. You could never swap them — 'the roads concentrated' or 'concentrate your attention at the junction' would misfire. Treat them as related only by the idea of a point, and otherwise distinct.
What does it mean when two fields intersect?
It means they share common ground — a point or area where they overlap — while remaining separate fields, as when 'law and ethics intersect'. The image is the crossing roads in the scene above. Concentrate is quite different: it would mean gathering many efforts or resources to one point, not two fields sharing an overlap.
What is an intersection?
The noun has two everyday lives: the point or place where things cross — a road intersection — and, in mathematics, the set of elements two sets share. Both keep intersect's core of a shared point between things that stay distinct. Concentrate's noun, concentration, names a gathering to a point, focus, or the strength of a solution — a very different idea.
How do you pronounce concentrate and intersect?
Concentrate is KON-sen-trayt (US /ˈkɑːnsntreɪt/), stressed on the first syllable. Intersect is IN-ter-sekt (/ˌɪntərˈsekt/), with the main beat on 'sekt'. Both are common in academic writing — one about massing to a point, the other about paths crossing — so the pair is worth practising to keep the ideas apart.
Which word describes two roads crossing?
Intersect. Two roads intersect where they cross and then continue, each on its own heading, as in the scene above. You would not say the roads 'concentrated', which would mean many things gathering densely to a point. The tell is what happens at the point: intersect has two paths cross and part, concentrate masses many things there.
Can efforts be concentrated at a point where interests intersect?
Yes, and the two words then do different jobs in the same sentence. Interests may intersect at a shared concern — a crossing point — and a team may then concentrate its efforts there, massing resources on that one spot. Intersect marks where the paths meet; concentrate gathers strength to it. One locates the point, the other packs power into it.
Related
amalgamate vs concentrateamalgamate vs intersectblend vs concentrateblend vs intersect
concentrate — full entryintersect — full entry← All synonyms