(n.) The act of recurring; return.

Earth insertion LEM LM apogee attitude-control rocket backset backsliding backward motion backward step ballistic capsule burn capsule deep-space ship docking docking maneuver ferry rocket fuel ship homecoming injection insertion lapse lunar excursion module lunar module manned rocket module moon ship multistage rocket orbit parking orbit perigee reaction recession recidivation recidivism recursion reentrance refluence reflux regress regression relapse remigration retroaction retrocession retroflexion retrogradation retrogression retrusion return rocket rollback setback shuttle rocket soft landing space capsule space docking space rocket spacecraft spaceship sternway throwback