The overall shape, dimensions, proportions, and orientation of a work or its support.
Format describes the physical configuration of a work: its dimensions, proportions, orientation, and basic shape. In sculpture it can refer to the envelope or dimensional limits within which a relief, panel, maquette, monument, or other work is conceived.
Etymology
French format, from Latin formatus.
References
https://www.pierres-info.fr/glossaire_sculpture/index.html