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Related to horizontal mattress suture: vertical mattress suture
1. measured or contained in a plane parallel to that of the horizon
2. Economics relating to identical stages of commercial activity
(science and technology)
Being in a plane perpendicular to the gravitational field, that is, perpendicular to a plumb line, at a given point on the earth's surface.
At right angles to the direction of gravity; on the level; parallel to the horizon; neither vertical nor inclined.