1. vertical; straight up and down; upright. 2. Geometry. meeting a given line or surface at right angles. 3. maintaining a standing or upright position; standing up. 4. having a sharp pitch or slope; steep. 5. (initial capital letter) noting or pertaining to the last style of English Gothic architecture, prevailing from the late 14th through the early 16th century and characterized by the use of predominantly vertical tracery, an overall linear, shallow effect, and fine intricate stonework. http://wiki.answers.com/Q/What_is_perpendicular
Tags: 16th century, answer, answers, Architecture, character, english gothic architecture, Geometry, Gothic, initial capital letter, padding, perpendicular, pitch, position, right angles, slope, standing, stonework, straight, surface, upright, what is perpendicularWhat is perpendicular?
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If you want to get into more definitions you forgot the nouns:
- an instrument for indicating the vertical line from any point.
- an upright position.
- a sharply pitched or precipitously steep mountain face.
- a moral virtue or uprightness; rectitude.
- Nautical. either of two lines perpendicular to the keel line, base line, or designed water line of a vessel.
I like the last one personally. The dominant meaning though is geometric (point 2 above).