Line. A line is a straight one-dimensional figure having no thickness and extending infinitely in both directions. A line is sometimes called a straight line or, more archaically, a right line (Casey 1893), to emphasize that it has no “wiggles” anywhere along its length.Click to see full answer. Just so, what do you mean by a line?Line. A geometrical object that is straight, infinitely long and infinitely thin. A line is one-dimensional. It has zero width. If you draw a line with a pencil, examination with a microscope would show that the pencil mark has a measurable width.Also, what is line and its types? There are four types of lines: horizontal line, vertical line, perpendicular, and parallel lines. They are defined based on their orientation, and the angles if any, formed between them. Beside above, what is an example of a line? The definition of a line is a mark connecting two points, something stretched between two things, or two or more people standing in a row. An example of a line is a horizontal mark drawn on a piece of paper. An example of a line is caution tape marking off the scene of an accident. An example of a line is fishing wire.What are the 7 types of lines? Lines And Angles Class 7. Types of Line Horizontal Lines: When a line moves from left to right direction, it is horizontal. Vertical Lines: When a runs from top to bottom it is vertical. Parallel Lines: When two lines don’t meet each other at any point, even at infinity, then they are parallel.