The Thursday in Holy Week. It is part of the Triduum, or three holy days before Easter. It comes from the Latin mandatum novum, "new commandment," from Jn 13:34. The ceremony of washing feet was also referred to as "the Maundy." Maundy Thursday celebrations also commemorate the institution of the eucharist by Jesus "on the night he was betrayed." Egeria, a fourth-century pilgrim to Jerusalem, describes elaborate celebrations and observances in that city on Maundy Thursday. Special celebration of the institution of the eucharist on Maundy Thursday is attested by the Council of Hippo in 381. The Prayer Book liturgy for Maundy Thursday provides for celebration of the eucharist and a ceremony of the washing of feet which follows the gospel and homily. There is also provision for the consecration of the bread and wine for administering Holy Communion from the reserved sacrament on Good Friday. Following this, the altar is stripped and all decorative furnishings are removed from the church. See Eucharist; see Foot Washing.
Glossary definitions provided courtesy of Church Publishing Incorporated, New York, NY,(All Rights reserved) from "An Episcopal Dictionary of the Church, A User Friendly Reference for Episcopalians," Don S. Armentrout and Robert Boak Slocum, editors.