Definition of length:
the linear extent in space from one end to the other; the longest dimension of something that is fixed in place; "the length of the table was 5 feet"
continuance in time; "the ceremony was of short duration"; "he complained about the length of time required"
the property of being the extent of something from beginning to end; "the editor limited the length of my article to 500 words"
size of the gap between two places; "the distance from New York to Chicago"; "he determined the length of the shortest line segment joining the two points"
a section of something that is long and narrow; "a length of timber"; "a length of tubing"