Today’s OCD entry is templum.
templum, an augural term denoting (a) the field of vision defined by a ritual formula (templum in aere) to observe the (impetrative) auspices from the flight of birds; lightning was observed in the semicircular celestial templum; (b) the quadrangular area delimited and inaugurated by augures. Many official state functions had to take place in a templum (especially senatorial meetings and observations of the impetrative auspices); most shrines (aedes sacra) were templa (but not that of Vesta), also the Curia (2) and the Rostra (Varro in Gell. NA 14.7.7; Ling. 6.91, 7.6-13).