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Diagonal

2 stages from Greek to English.

Today it means a straight line connecting two non-adjacent corners of a shape
1
Stage 1 of 2
diagonios
Greek · ancient
"through the angles"
literally through the angles, from dia (through) and gonia (angle)
2
Stage 2 of 2
diagonal
English · 1500s
"a line connecting two non-adjacent corners of a shape"
settled as the geometric word for a line connecting two non-adjacent corners
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