the.com/strictness

means The quality of enforcing rules firmly and consistently, with little tolerance for deviation.

from From 'strict,' via Latin 'strictus' — 'drawn tight, bound' — the past participle of 'stringere,' to draw tight or bind. The same root gives us 'stringent' and 'constrict.' So strictness has always meant something pulled taut, leaving no slack — the rope with no give is the same rope that holds the knot.