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In Christian theology, ecclesiology is the study of the Church, the origins of Christianity, its relationship to Jesus, its role in salvation, its polity, its discipline, its eschatology, and its l…

In thermodynamics, an irreversible process is a process that cannot be undone. All complex natural processes are irreversible, although a phase transition at the coexistence temperature (e.g. melti…

Excommunication is an institutional act of religious censure used to deprive, suspend, or limit membership in a religious community or to restrict certain rights within it, in particular those of b…

A university (from Latin universitas ' a whole ' ) is an institution of tertiary education and research which awards academic degrees in several academic disciplines. University is derived from the…

Catechesis (/ˌ k æ t ə ˈ k iː s ɪ s / ; from Greek: κατήχησις , "instruction by word of mouth", generally "instruction") is basic Christian religious education of children and adults, often from a …

In Christian architecture the baptistery or baptistry (Old French baptisterie; Latin baptisterium; Greek βαπτιστήριον , 'bathing-place, baptistery', from βαπτίζειν , baptízein, 'to baptize') is the…

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