1. the point of intersection of lines or the point opposite the base of a figure;

2. the highest point (of something);

- Example: "at the peak of the pyramid"

[syn:

The Collaborative International Dictionary of English v.0.48:

Vertex \Ver"tex\, n.; pl. E. Vertexes, L. Vertices. [L. vertex, -icis, a whirl, top of the head, top, summit, from vertere to turn. See Verse, and cf. Vortex.] A turning point; the principal or highest point; top; summit; crown; apex. Specifically: [1913 Webster] (a) (Anat.) The top, or crown, of the head. [1913 Webster] (b) (Astron.) The zenith, or the point of the heavens directly overhead. [1913 Webster] (c) (Math.) The point in any figure opposite to, and farthest from, the base; the terminating point of some particular line or lines in a figure or a curve; the top, or the point opposite the base. [1913 Webster] Note: The principal vertex of a conic section is, in the parabola, the vertex of the axis of the curve: in the ellipse, either extremity of either axis, but usually the left-hand vertex of the transverse axis; in the hyperbola, either vertex, but usually the right-hand vertex of the transverse axis. [1913 Webster] Vertex of a curve (Math.), the point in which the axis of the curve intersects it. Vertex of an angle (Math.), the point in which the sides of the angle meet. Vertex of a solid, or Vertex of a surface of revolution (Math.), the point in which the axis pierces the surface. [1913 Webster]WordNet (r) 3.0 (2006):

vertex n 1: the point of intersection of lines or the point opposite the base of a figure 2: the highest point (of something); "at the peak of the pyramid" [syn: vertex, peak, apex, acme]Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "vertex": L, acme, angle, apex, apogee, bend, bifurcation, bight, brow, cant, cap, chevron, climax, cloud nine, coin, corner, crank, crest, crook, crotchet, crown, culmen, culmination, deflection, dogleg, edge, elbow, ell, extreme limit, extremity, fork, furcation, heaven, heavens, height, heights, high noon, highest pitch, highest point, hook, inflection, knee, limit, maximum, meridian, mountaintop, ne plus ultra, no place higher, nook, noon, peak, pinnacle, pitch, point, pole, quoin, ridge, roof, seventh heaven, sky, spire, summit, swerve, tip, tip-top, top, upmost, upper extremity, uppermost, utmost, veer, very top, zag, zenith, zig, zigzag