Left: adj. and N. (word of unknown origin).
The word “left” has many meanings:
I) Idea of deviation, clumsiness:
1. Which is crooked, which presents a deviation (deviated, oblique, twisted).
Table, left board.
Mathematics: Geometric figure, left curve, which is not contained in a plane (example: the helix).
Left quadrilateral, whose vertices are not coplanar.
Lines left, not coplanar two by two.
Left surface: undeveloped ruled surface...
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