Next to or adjoining something else
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Adjacent means 'next to'
Assuming that you mean diagonal (not diagnol) lines, they are straight lines that join non-adjacent vertices in a polygon or polyhedron.
They are straight joining vertices to non-adjacent vertices.
A pair of angels in a straight line formed by a line or half-line meeting it is called adjacent angels. Adjacent angels will add up to 180°.
Thereby forming a straight line.