Liturgical Initiation refers to the sacramental process by which a person is fully received into the Catholic Church, specifically through the Rite of Christian Initiation for Adults (RCIA). It involves stages of preparation, study, and celebration of the sacraments (Baptism, Confirmation, Eucharist), marking a person's transition into a community of faith. This process aims to shape faith and prepare the individual for full participation in the Church's liturgy.