Intersect and separate pull in opposite directions. To intersect is for two lines or paths to cross at a shared point and carry on past it (two roads intersect at a junction). To separate is to move or keep things apart, or to sort a mixture (a fence separates two gardens; separate the yolk from the white). Where intersecting paths come to a point in common, separating pulls things away from each other so a clean gap opens between them.
One word brings paths to a shared point; the other holds things apart. Intersect, from inter- ('between') and secare ('to cut'), is two lines crossing — they touch at one point and both continue. Separate, from the Latin separare ('to disjoin'), is the opposite motion: things that were together are drawn apart, or a mixture is sorted into distinct pieces, and a gap is left between them. So two roads intersect at a crossing, while a low wall separates two fields. Intersecting paths share a point; separated things keep their distance.
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.
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.
| intersect | separate | |
|---|---|---|
| Meaning | cross at a point and carry on | move or keep apart; sort |
| The point | a shared crossing | a gap opens between them |
| Relationship | paths touch, then continue | things kept distinct |
| Typical of | roads, lines, sets, fields | objects, groups, mixtures |
| Often with | intersect at · intersect with | separate from · separate into |
| Noun | intersection | separation |
Set a crossroads against two pulled-apart magnets. Intersect is the two cars crossing at a junction — they share one square of ground, a single point in common, then each drives on. Separate is the clamped magnets drawn apart until the pull snaps and a clean gap opens — no shared point at all, just distance. So intersecting paths meet at a point; separated things are held apart from each other. If two lines cross at a shared point, they intersect; if joined things are drawn apart, they separate.
intersect
- iTwo straight roads intersect at the town square, and each stream of traffic continues out the far side.
- iiThe new bypass intersects the old highway just north of the river.
- iiiHer research intersects with public health wherever clean water is studied.
separate
- iA low fence separates the two gardens without blocking the view.
- iiReferees rushed in to separate the players before it turned into a brawl.
- iiiSeparate the eggs, then whisk the whites until they stiffen.
They contrast rather than collide: intersect is about paths sharing a point, separate about things kept apart. Mind separate's spelling (sep-A-rate, never 'seperate') and its heteronym pronunciations — verb /ˈsepəreɪt/, adjective /ˈseprət/. And keep intersect distinct from intercept (to cut something off in transit), which examiners like to test.