The horizontal coordinate (x-axis value) of a point on a graph or coordinate system, showing how far left or right the point is.
From Latin 'abscissa' (feminine past participle of 'abscindere', meaning 'to cut off'), derived from 'ab-' (from) and 'scindere' (to cut). The term was used in mathematics to describe the distance 'cut off' along the horizontal axis.
Medieval mathematicians literally thought of coordinates as line segments 'cut off' from axes—the word 'abscissa' preserves this cutting metaphor! The term reveals how mathematical thinking evolved from geometric drawing to abstract number systems.
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