From WordNet (r) 3.0 (2006) [wn]:
intersection
n 1: a point where lines intersect [syn: intersection,
intersection point, point of intersection]
2: a junction where one street or road crosses another [syn:
intersection, crossroad, crossway, crossing,
carrefour]
3: a point or set of points common to two or more geometric
configurations
4: the set of elements common to two or more sets; "the set of
red hats is the intersection of the set of hats and the set
of red things" [syn: intersection, product, {Cartesian
product}]
5: a representation of common ground between theories or
phenomena; "there was no overlap between their proposals"
[syn: overlap, convergence, intersection]
6: the act of intersecting (as joining by causing your path to
intersect your target's path)
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Intersection \In`ter*sec"tion\, n. [L. intersectio: cf. F.
intersection.]
[1913 Webster]
1. The act, state, or place of intersecting.
[1913 Webster]
2. (Geom.) The point or line in which one line or surface
cuts another.
[1913 Webster]