vertical

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Being or situated at right angles to the horizon; upright.
2. adj. Situated at the vertex or highest point; directly overhead.
3. adj. Anatomy Of or relating to the vertex of the head.
4. adj. Economics Relating to or involving all stages from production to sale: vertical integration.
5. adj. Relating to or composed of elements at different levels, as of society.
6. n. Something vertical, as a line, plane, or circle.
7. n. A vertical position.

Century Dictionary and Cyclopedia

1. Of or relating to the vertex; situated at the vertex, apex, or highest point; placed in the zenith, or point in the heavens directly overhead; figuratively, occupying the highest place.
2. Specifically, being in a position or direction perpendicular to the plane of the horizon; upright; plumb. A vertical line or plane is one in which, if produced, the vertex or zenith lies. The word is applied to a number of tools and machines, to indicate the position in which they are placed or used: as, the vertical mill; a vertical planer.
3. In medicine, of or relating to the vertex, or crown of the head.
4. In zoology and anatomy: Pertaining to or placed on the vertex, or crown of the head; sincipital; coronal: as, vertical stemmata of an insect; vertical eyes of a fish; the vertical crest of some birds is horizontal when not erected.
5. Placed or directed upward or downward; upright or downright; being at right angles with an (actual or assumed) horizon. Vertical in this sense is either intrinsic, with reference to an actual or assumed horizontal plane of the body itself, as to the dorsal or ventral surface of most animals, or extrinsic, with reference to the earth's horizon; in the latter case it is the same as def. 2.
6. See circle.
7. In conic sections, a plane passing through the vertex of a cone and through its axis.
8. In perspective, a plane perpendicular to the geometrical plane, passing through the eye, and cutting the perspective plane at right angles.
9. n. A vertical circle, plane, or line.

Wiktionary

1. n. A vertex or zenith
2. n. A vertical geometrical figure; a perpendicular
3. n. An individual slat in a set of vertical blinds.
4. n. A vertical component of a structure.
5. adj. along the direction of a plumbline or along a straight line that includes the center of the Earth
6. adj. In a two dimensional Cartesian co-ordinate system, describing the axis oriented normal (perpendicular, at right angles) to the horizontal axis.

GNU Webster's 1913

1. adj. Of or pertaining to the vertex; situated at the vertex, or highest point; directly overhead, or in the zenith; perpendicularly above one.
2. adj. Perpendicular to the plane of the horizon; upright; plumb.
3. n. Vertical position; zenith.
4. n. A vertical line, plane, or circle.

WordNet 3.0

1. n. something that is oriented vertically
2. adj. upright in position or posture
3. n. a vertical structural member as a post or stake
4. adj. relating to or involving all stages of a business from production to distribution
5. adj. of or relating to different levels in a hierarchy (as levels of social class or income group)
6. adj. at right angles to the plane of the horizon or a base line