rotunda

1. (architecture) A round building, usually small, often with a dome.Examples: "The rotunda begun but never completed by Abbot Wulfric (1047–59) at St Augustine’s Abbey as a link between the church of St Mary and that of St Peter and St Paul is an unusual and ambitious example of mid-eleventh-century English architecture which partly survives (fig. 4.6, top). […] Many of these rotundae are known to have had a special funerary function (as was the case at Canterbury)."; "The purely Greek character of the temple is revealed in the fact that there is no portico aligning the structure; Roman tholoi and rotundae are usually distinguished by a portico."; "Access to the shafts is gained via a brick entrance rotunda below a glass dome. The walls of these rotundae are built over the outer edge of caissons which hold the shafts; […]"

2. (typography, frequently capitalized) A Gothic typeface used in early printed books in Northern Italy, based on a rounded script developed in the 13th cent.; the manuscript hand on which this typeface was based.

3. (Philippines) Alternative spelling of rotonda.Examples: "TPLEX Rotunda is a roundabout located in Rosario, La Union."

4. (geometry) A form of cupola that has pentagons rather than squares or rectangles.