(Christianity) the hour of fasting and prayer before communion is to be taken. / (Ireland, informal) the hour between 2.30 pm and 3.30 pm that pubs formerly had to shut to comply with licencing laws.

(informal, usually derogatory) A member of any Christian church characterized by ecstatic behaviour; especially of the Pentecostal Church. / (informal, derogatory) A devoutly religious Christian person.

(Christianity) Maundy Thursday, the Thursday before Easter / (now rare) Ascension Day

The Wednesday of Holy Week; the day before Maundy Thursday.

(historical) A coalition of Russia, Austria and Prussia formed in 1815, ostensibly to regulate all national and international relations in accordance with the principles of Christian charity.

The Bible, or by extension the scripture of another religion.

(Christianity) In certain Christian churches, water that has been sanctified by a priest or bishop for the purpose of baptism or for the blessing of persons, places, or things.

the episcopal jurisdiction of the Bishop of Rome, commonly known as the Pope. It is the preeminent see of the Catholic Church. It is also the sovereign entity headed by the Pope which governs the Vatican and represents the Catholic Church in temporal affairs.

(idiomatic, slang, mildly vulgar) An expression of amazement: holy cow, holy shit.

plural of holy war