(n) A line seen in its true size in the horizontal plane.
An actual or imaginary line that runs across the work defining the place where sky and earth come together.
a rapidly repeated single note, a vertical line is a chord, and oblique lines are represented by ascending or descending scales
a subtraction operator if it is small relative to the characters surrounding it and horizontally in-line with them
A line of the form = ; i.e. a line with slope 0.
A straight line parallel to the horizon.
A line that is parallel to the horizon. A horizontal line is straight across.