There are many definitions, here is one:
A line (straight line) is a geometrical form that is straight, infinitely long and infinitely thin, consisting of an infinite number of finite points. Any two points can be connected to form a line. (A straight line is the shortest path between any two points.)
A geometric line can also be curved, and may form a closed path.
A line of poetry is just that : the words in a single line, which are defined by meter and by rhythm, and possibly by characteristics such as assonance, consonance, and rhyme.
A line in practical uses can be a string used for fishing, a rope used to do work, or a boundary or borderline. It can be a number of objects or constructs in a row.
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its a line that is vertical and a symmetry
A line that has a starting point and an end point.
The \"line of best fit\" as a science definition is a line that is drawn through a specific set of points that shows the direction the points are heading.
The definition of a line of symmetry is a line that can be draw down the center of any shape or object to show mirror image of the other side. where each side is a mirror image of the other side.
The definition to an Extension Line is:A line used to visually connect the ends of a dimension line to the relevant feature on the part.How Extension Lines are used:Extension lines are solid and are drawn perpendicular to the dimension line.- DarKeneD