the.com/boundary
the line you draw so others stop coloring outside you.
means A line, real or imagined, that marks the limit of something — a territory, a relationship, a behavior, or a self.
from From the older English 'bound,' meaning a limit or border, which came through Anglo-Norman French 'bunne' from a Medieval Latin word 'bodina' of probably Celtic origin — the 'bound-ary' suffix simply turned a limit into the line that marks it. The same 'bound' lives on in 'out of bounds' and 'boundless.'
- in math
- a set's edge can have zero thickness
- borders shift
- rivers redraw national lines without asking anyone
- physics
- event horizon is the universe's strictest boundary
- psychology
- saying no is a complete sentence
line of control — disputed 740km border between india and pakistan in kashmir since 1949
demarcation line korea — 38th parallel dividing north and south korea since 1953 armistice
international date line — 180-degree meridian in pacific ocean separating calendar days
mackinac straits — 5-mile water boundary between michigan's upper and lower peninsulas