adjective / adverb
long
LAWNG/lɔːŋ/
Extending a substantial distance between its endpoints.
The long wooden plank lies beside a much shorter one.

Etymology
Old English lang already expressed considerable extent from end to end, so the modern spatial meaning continues directly. The same adjective also described time as extended in duration.
In context
the 158 km long ban Tong Chong Expressway is about to open to traffic
More examples
- A long ribbon trails from her hat.
- The bridge is nearly a mile long.
- We need a longer ladder to reach the roof.
Forms
long · longer · longest
length noun — The distance from end to end.
lengthen verb — To make or become longer.