Apse apse architecture. A semicircular or polygonal, frequently vaulted recess, especially at the end of a church's sanctuary. The word is derived from Greek, meaning "egg shaped." In Christian churches, this term is also applied to a similar structure at the end of a nave. 2. Assembling or gathering together; a collection or bunching up of people: as, a crowd has assembled in front of the house. Also, an assembly of priests or bishops. (Allied to BISE.) 3. A break taken by the clergy during their services when water is given or prayer offered; also, an interval between two parts of a service when no one is expected to speak. Now used only in reference to the Church Assembly. 4. An official meeting of bishops in some countries of Africa, Asia, and Oceania to discuss issues before them. They make decisions by vote on proposed resolutions. 5. A period of time during which schools are not in session but instead undergo renovation or restructuring projects. Often associated with building expansions or renovations to existing buildings. Called "recesses" because students are absent from school while this activity takes place.