demarcation
Five years is a traditional line of demarcation that defines true long-term investing.
There's a thin line of demarcation between criminality and immorality involved in white collar crimes.
There is a sharp line of demarkation between the affected and unaffected regions of skin.
SMART Vocabulary: related words and phrases Territorial boundaries
border
bound
boundary
bounded by something
bourne
checkpoint
demarcation
frontier
hard border
no-man's-land
passport control
state line
the Iron Curtain
the Mason-Dixon Line
transboundary
unhedged
You can also find related words, phrases, and synonyms in the topics:
Edges & extremities of objects
Range and limits