The quality or state of being compact; the degree to which something is tightly packed or compressed.
From 'compacted' + '-ness' (suffix forming abstract nouns). This noun emerged to quantify the abstract property of compactness in technical and scientific contexts.
Compactedness in spacecraft design is literally life-or-death—the more compactly designed a spacecraft's life support systems are, the more space astronauts have to exercise and maintain psychological health on long missions.
Complete word intelligence in one call. Free tier — 50 lookups/day.