Abacus - a large slab placed above the column capital to support the architrave or an arch placed above it.
Adyton - the most sacred inner part of a temple, usually at the end of the cella furthest from the entrance, often with restricted access to the initiated or priests.
Aedicule - a frame formed by two columns and an entablature with pediment.
Architrave - the lowest part of the entablature, the part below the frieze.
Amphiprostyle Temple - when both façades have columns, e.g.: the temple of Nike, Athens.
Atlantide - a sculpted male figure acting as a column to support an entablature, named after Atlas.
Attic Story - the part placed above the entablature of a building, e.g.: often seen in triumphal arches.
Buttress - a mass placed to support a wall, especially when the wall bears an arch or heavy weight. Flying buttresses support a weight over space and allow for walls to be weakened by the inclusion of niches and windows.
Capital - the crown which joins the top of a column with the abacus and aids in distributing weight. Different types include the simple convex Doric and the highly decorative Corinthian with stylized acanthus leaves.
Cavea - the seated area of a theatre, usually built into a natural slope.
Cella - the inner area of a temple, usually rectangular and without windows, sometimes columned. Often subdivided into smaller rooms, the largest of which often housed a large cult statue to a particular deity.
Column - used to support the abacus and architrave without the necessity of a wall. There are several types including the simple and earliest the Doric. They may also be free-standing and often commemorate significant historical events such as Trajan's Column.
Conch - also known as an apse, a recess in a wall often highly decorated or containing a statue.
Cornice - the decorative projecting part at the top of the entablature which also aided in drainage of rainwater.
Crepidoma - also crēpis, the three steps on which stand the columns of a temple. The final top step is known as the stylobate.
Decastyle Temple - with ten columns at each façade, e.g.: the temple of Apollo Didymaeus at Miletus.
Dentils - a regular series of squares or rectangles used to decorate cornices.
Diazoma - the walkway which horizontally divides the seats in a theatre.
Dipteral Temple - when there are a double row of columns on all sides, e.g.: the Parthenon.
Dodecastyle Temple - with twelve columns at each façade.
Drum - the individual circular pieces used to construct some types of columns.
Egg and Dart Ornamentation - a typical feature of decoration on cornices.
Engaged Columns - columns which are incorporated within a wall.
Entablature - the structure which lies horizontally above columns and which is composed of the architrave, frieze and cornice.
Entasis - the swelling of a column at its base and centre to give the illusion of being perfectly straight.
Flute - the curved vertical channel carved in a column.
Frieze - the widest and central part of the entablature often richly decorated with relief sculpture.
Hexastyle Temple - with six columns at each façade, e.g. the Maison Carré at Nimes.
in antis - when the walls of a portico extend in line with the façade columns.
Intrados - the inner surface of an arch.
Metope - a square space in the frieze between two triglyphs, often filled with relief sculpture or ornaments such as shields.
Monolithic Column - a column carved from a single piece of stone.
Octastyle Temple - with eight columns at each façade, e.g.: the temple of Bacchus at Baalbek.
Opisthodomos - The small room at the rear of a temple commonly used as a treasury.
Parodoi - the large arched gateways, either side of the skēnē, through which an audience entered a theatre.
Pedestal - the block on which stands a column or statue, composed of the plinth, torus, dado and fascia.
Pediment - the triangular space above the entablature at the short sides of a temple. Often richly decorated with sculpture in the round.
Peripteral Temple - when all four external sides have columns.
Peristyle - the rows of columns which surround a temple or courtyard.
Pilaster - an ornamental column carved in relief on a wall surface.
Portico - a space for walking, usually columned, e.g.: at the front of a temple.
Pronaos - the space between the outer columns and cella entrance in a temple.
Prostyle - a temple with columns only at the front façade.
Sima - the gutter which collected rainwater from the roof of a temple, often containing decorative spouts at regular intervals.
Skēnē - the background on a theatre stage, later examples were monumental in design.
Stereobate - the surface on which the stylobate stands.
Stoa - a long and narrow columned building often used to enclose a particular space at religious sites and public places such as markets and gymnasia. Used as a meeting place and shelter from the weather.
Stylobate - the foundation on which a row of columns stand. Often slightly curved to aid drainage.
Tetrastyle Temple - with four columns at each façade.
Tholos - A circular-shaped temple, the most famous example being at Delphi.
Triglyph - a decorative element of a frieze with two vertical grooves. Often used in alteration with metopes.
Volutes - the scrolls of an Ionic capital.