The quality, state, or condition of being centripetal; the tendency to move toward or seek the center.
From centripetal adjective plus abstract noun suffix -cy. An alternative form to centripetence, both created in technical vocabulary development of 18th-19th century physics.
English offers both centripetency and centripetence for essentially the same meaning, showing how technical vocabulary sometimes develops redundancy—it's like having two words where one would do, a quirk of specialized language.
Complete word intelligence in one call. Free tier — 50 lookups/day.