From ancient canon law to CIC/1917, reconciliation (Lat. reconciliatio) denoted the (liturgical) absolution required for a church, cemetery, or altar to be used again after desecration or profanation (CIC/1917 cc. 1172–1177; 1207).
It also denotes reconciliation with God and the church through the sacrament of penance (Repentance: IV, 3.a); cf. CIC/1983 cc. 959f. and CCEO cc. 718 and 720 §1) and specifically restoration to full communion with the church through lifting an excommunication incurred through apostasy (Apostate), heresy, …