length

length /ˈlɛŋθ/ noun
plural lengths
length
/ˈlɛŋθ/
noun
plural lengths
Britannica Dictionary definition of LENGTH
1 
a  : the distance from one end of something to the other end : a measurement of how long something is
[noncount]
[count]
— see also focal length
b  [noncount] : the size or extent of a piece of writing
c  [noncount] : the quality or state of being long
2 
[noncount] : the amount of time something lasts
3 
[count] : the length of something used as a unit of measure
— see also at arm's length at 1arm
4 
[count] : a piece of something that is long and thin or narrow
5 
[noncount] : a measure of how far down on your body something (such as your hair or a piece of clothing) reaches
— see also floor-length, knee-length, shoulder-length

at length

1 
: for a long time
2 
: in a full or complete way
3 
literary : after a long time

go to any length

or go to any/extreme/great (etc.) lengths
: to make a great or extreme effort to do something

the length and breadth of

: through all parts of (a place)