Definition of "Length" :

noun: a section of something that is long and narrow

"A length of timber."

noun: continuance in time

"He complained about the length of time required."

noun: 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."

noun: size of the gap between two places

"He determined the length of the shortest line segment joining the two points."

noun: the property of being the extent of something from beginning to end

"The editor limited the length of my article to 500 words."