perpendicularity

1. The relation of opposition between things at right angles (synset 113851260)
   is a type of: opposition - a direction opposite to another
   same as: orthogonal opposition, orthogonality
2. The quality of being at right angles to a given line or plane (especially the plane of the horizon) (synset 105079377)
   is a type of: oblongness, rectangularity - the property of being shaped like a rectangle

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