Absis (bahasa Inggris: abscissa bentuk jamak abscissae, abscissæ atau abscissas), di dalam matematika, adalah jarak tegak lurus suatu titik dari sumbu-y.Absciso estas pozitiva en kvaronoj I kaj IV de la koordinata ebeno kaj negativa en kvaronoj II kaj III. Dum desegnado de grafiko de matematika funkcio oni kutime dekalkulas laŭ absciso argumenton de la funkcio. La alia, vertikala, akso de dukoordinata koordinata sistemo estas ordinato. Unuafoje la termino estis uzita en verkojde la itala matematikisto (1623–1697). En la ebeno la abscisa akso estas kutime metita horizontale. La absciso de punkto estas kutime signifata per la litero x. La unua el la karteziaj koordinatoj, kiuj difinas la situon de punkto sur la ebeno aŭ en la tridimensia spaco.The ordinate of a point is the signed measure of its projection on the secondary axis, whose absolute value is the distance between the projection and the origin of the axis, and whose sign is given by the location on the projection relative to the origin (before: negative after: positive). An ordered pair consists of two terms-the abscissa (horizontal, usually x) and the ordinate (vertical, usually y)-which define the location of a point in two-dimensional rectangular space: The abscissa of a point is the signed measure of its projection on the primary axis, whose absolute value is the distance between the projection and the origin of the axis, and whose sign is given by the location on the projection relative to the origin (before: negative after: positive). In mathematics, the abscissa (/æbˈsɪs.ə/ plural abscissae or abscissas) and the ordinate are respectively the first and second coordinate of a point in a Cartesian coordinate system: abscissa -axis (horizontal) coordinateordinate -axis (vertical) coordinate Usually these are the horizontal and vertical coordinates of a point in plane, the rectangular coordinate system. The distance of a point from x-axis scaled with the y-axis is called ordinate.For example, if (x, y) is an ordered pair in the Cartesian plane, then the first coordinate in the plane (x) is called the abscissa and the second coordinate (y) is the ordinate. The distance of a point from the y-axis, scaled with the x-axis, is called abscissa or x coordinate of the point. In common usage, the abscissa refers to the (x) coordinate and the ordinate refers to the (y) coordinate of a standard two-dimensional graph.v kartézské souřadné soustavě ji reprezentuje osa x.
hodnota, kterou na této ose reprezentuje daná souřadnice. Abscisa je vodorovná osa souřadnic grafu v souřadné soustavě, resp.
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