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z-co·or·di·nate | \ ˌzē-kō-ˈȯrd-nət 
; -ˈȯr-də-nət, -də-ˌnāt; Canadian, British, and Australian ˌzed- \
; -ˈȯr-də-nət, -də-ˌnāt; Canadian, British, and Australian ˌzed- \Definition of z-coordinate
: a coordinate whose value is determined by measuring parallel to a z-axis
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The first known use of z-coordinate was circa 1956
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