axis	One of two perpendicular lines of a coordinate place that intersect at the origin. The plural form of axis is axes.
coordinate plane	A plane formed by the intersection of a horizontal number line called the x-axis and a vertical number line called the y-axis.
ordered pair	A pair of numbers that indicates a point on a coordinate plane.
origin	The point where the x-axis and the y-axis intersect on the coordinate plane (0, 0).
quadrant	The x- and y-axes divide the coordinate plane into four regions. These regions are called quadrants.
x-axis	The horizontal axis of a coordinate plane. Also the horizontal axis of a bar graph or histogram.
x-coordinate	The first number in an ordered pair, which tells the distance to the right or left from the origin when graphing in a coordinate plane.
y-axis	The vertical axis of a coordinate plane. Also the vertical axis of a bar graph or histogram.
y-coordinate	The second number in an ordered pair, which tells the distance to move up or down from the origin when graphing in a coordinate plane.