sabbath(n = noun.time) - a day of rest and worship: Sunday for most Christians; Saturday for the Jews and a few Christians; Friday for Muslims;
is a kind of day of rest, rest day
Derived forms adjective sabbatarian₁, adjective sabbatical₁

1.  A season or day of rest; one day in seven appointed for rest or worship, the observance of which was enjoined upon the Jews in the Decalogue, and has been continued by the Christian church with a transference of the day observed from the last to the first day of the week, which is called also Lord's Day. [1913 Webster]
"Remember the sabbath day, to keep it holy." [1913 Webster]

2.  The seventh year, observed among the Israelites as one of rest and festival. Lev. xxv. 4. [1913 Webster]

3.  Fig.: A time of rest or repose; intermission of pain, effort, sorrow, or the like. [1913 Webster]
"Peaceful sleep out the sabbath of the tomb." [1913 Webster]

sabbath, n.
1 (in full sabbath day) a day of rest and religious observance kept by Christians on Sunday, Jews on Saturday, and Muslims on Friday.
2 a period of rest.
3 (in full witches' sabbath) a supposed general midnight meeting of witches with the Devil.

Etymology:
OE sabat, L sabbatum, & OF sabbat, f. Gk sabbaton f. Heb. sabbat f. sabat to rest

N  repose, rest, silken repose, sleep, relaxation, breathing time, halt, stay, pause, respite, day of rest, dies non, Sabbath, Lord's day, holiday, red-letter day, vacation, recess, reposing, relaxed, unstrained, unstressed, at rest, The best of men have ever loved repose, to repair our nature with comforting repose.

N  rite, ceremony, ritual, liturgy, ceremonial, ordinance, observance, function, duty, form, formulary, solemnity, sacrament, incantation, service, psalmody, ministration, preaching, preachment, predication, sermon, homily, lecture, discourse, pastoral, baptism, christening, chrism, circumcision, baptismal regeneration, font, confirmation, imposition of hands, laying on of hands, ordination, excommunication, Bar Mitzvah, Bas Mitzvah, Bris, Eucharist, Lord's supper, communion, the sacrament, the holy sacrament, celebration, high celebration, missa cantata, asperges, offertory, introit, consecration, consubstantiation, transubstantiation, real presence, elements, mass, high mass, low mass, dry mass, matrimony, burial, visitation of the sick, seven sacraments, impanation, subpanation, extreme unction, viaticum, invocation of saints, canonization, transfiguration, auricular confession, maceration, flagellation, sackcloth and ashes, penance, telling of beads, processional, thurification, incense, holy water, aspersion, relics, rosary, beads, reliquary, host, cross, rood, crucifix, pax, pyx, agnus Dei, censer, thurible, patera, eileton, Holy Grail, prayer machine, prayer wheel, Sangraal, urceus, ritualism, ceremonialism, sabbatism, sabbatarianism, ritualist, sabbatarian, holyday, feast, fast, Sabbath, Pentecost, Advent, Christmas, Epiphany, Lent, Passion week, Holy week, Easter, Easter Sunday, Whitsuntide, agape, Ascension Day, Candlemas, Ash Wednesday, Good Friday, Holy Thursday, Lammas, Martinmas, Michaelmas, All SAint's DAy, All Souls' Day, Ramadan, Ramazan, Bairam Passover, Shabuoth, Yom Kippur, Day of Atonement, Rosh Hashana, New Year, Hanukkah, Chanukkah, Feast of Lights, Purim, Feast of lots, ritual, ritualistic, ceremonial, baptismal, eucharistical, paschal, what art thou, thou idol ceremony?.

sabbath school, witches' sabbath