coincide vs intersect
Coincide and intersect both involve a shared point, with a difference in how much is shared. Coincide is for two things to occupy exactly the same point or line, or happen at the same time — an exact overlap. Intersect is to cross at a point and continue past it. Coincide is an exact overlap; intersect is a crossing.
Quick rule: two things fall on exactly the same point, line or time (overlap) → coincide; two paths cross at one point and continue → intersect.
Two rings turn on their own business — different centres, different speeds, neither leaning toward the other — yet the geometry leaves them one shared point and the timing one shared moment, and there both dots land and light up before each is carried off along its own curve again.
/ˌkoʊɪnˈsaɪd//ˌkəʊɪnˈsaɪd/·verbA car comes along the flat road and another drops down the road that crosses it; for one instant they share the very same square of ground and the junction flares — then they are past it, each still on its first heading.
/ˌɪntərˈsekt//ˌɪntəˈsekt/·verbBoth share a point, but coincide overlaps exactly and intersect merely crosses. Coincide, from co- 'together' and incidere 'to fall upon', means two things fall on exactly the same spot, line or moment — they overlap. Intersect, from inter- 'between' and secare 'to cut', means two things cross at a point and then carry on their own ways. Two lines that coincide lie exactly on top of each other; two that intersect cross at one point and diverge. One is a full overlap; the other a single crossing.
What 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.
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.
At a glance
| coincide | intersect | |
|---|---|---|
| Meaning | occupy the same point, line or time | cross at a point and continue |
| How much shared | an exact overlap | a single crossing point |
| In geometry | lines lie exactly on each other | lines cross at one point, then part |
| Often with | dates, events, lines, opinions | roads, lines, sets, disciplines |
| Noun | coincidence | intersection |
| Example | The lines coincide. | The roads intersect. |
How to remember the difference
Ask whether two things overlap exactly or merely cross. Coincide has two things fall on exactly the same point, line or moment — an exact overlap, two rings meeting at their one shared point. Intersect has two paths cross at one point and continue their own ways. If two things overlap exactly, they coincide; if two paths cross and part, they intersect.
Examples
coincide
- The two lines coincide at exactly one point.
- Her visit happened to coincide with the festival.
- Our views on the matter largely coincide.
intersect
- The two roads intersect at the edge of town.
- Their research interests intersect at climate policy.
- The line intersects the circle at two points.
In geometry the distinction is sharp: lines that coincide lie exactly on top of one another (sharing every point), while lines that intersect cross at just one point and diverge. In everyday use, coincide stresses exact overlap in space or time, and can mean agreement; intersect stresses a crossing where two paths share common ground but continue apart.
In TOEFL & IELTS
A precise pair for maths, geography and argument. Coincide is an exact overlap — lines that coincide share every point; events that coincide happen at the same time; views that coincide agree. Intersect is a single crossing — roads intersect, sets intersect, fields of study intersect at a shared concern. Examiners reward the difference: full overlap (coincide) versus a crossing point (intersect). The nouns are coincidence and intersection.
FAQ
- What is the difference between coincide and intersect?
- Coincide is for two things to occupy exactly the same point, line or time — an exact overlap — while intersect is to cross at a point and continue past it. Coincide is a full overlap; intersect is a single crossing. In the scenes above, two rings meet at their one shared point, while two roads cross at a junction and each drives on.
- What is the difference in geometry?
- Sharp: lines that coincide lie exactly on top of one another, sharing every point — they are really the same line. Lines that intersect cross at just one point and then diverge. So coinciding lines overlap completely, while intersecting lines meet at a single point. It is a common exam distinction in coordinate geometry.
- Are coincide and intersect the same?
- They are close but not the same. Both involve a shared point, but coincide means an exact overlap — two things falling on the same spot, line or moment — while intersect means a crossing where two paths share one point and continue apart. Overlapping completely (coincide) is more than merely crossing (intersect).
- What does coincide mean when opinions coincide?
- It means they agree — 'our views coincide' is a formal way of saying we think the same, an exact overlap of position, like the rings meeting at their shared point in the scene above. Intersect's figurative use is weaker: two fields intersect where they share common ground but stay distinct. So coincide is full agreement, intersect a shared overlap.
- What are the noun forms of coincide and intersect?
- Coincidence and intersection. 'A coincidence' usually names a chance meeting of events at one time; 'an intersection' names a crossing point — a road intersection, or in maths the elements two sets share. The nouns keep the contrast: an exact overlap versus a crossing point.
- Which word fits two lines lying exactly on each other?
- Coincide. Two lines coincide when they lie exactly on top of one another, sharing every point, an exact overlap like the rings meeting at their shared point in the scene above. Intersect would mean they merely crossed at one point. The tell is how much is shared: full overlap (coincide) versus a single crossing (intersect).
- Which word fits two roads crossing?
- Intersect. Two roads intersect where they cross at a point and continue, as in the scene above. Coincide would mean they lay exactly on top of each other — the same road. The tell is how much is shared: intersect is a single crossing, coincide an exact overlap.