Legal term
[Prague] Ot: podlaží
An accessible part of a building demarcated by two consecutive top faces of a structural ceiling or the top face of a sub-floor on the ground or on a roof; parts of a building that have differing floor heights up to one half of this floor are also considered to be one floor1
[Portugal] Ot: piso (de um edifício) | Ot.2: pavimento
The floor of a building is each of the overlapping, covered planes with a regulatory ceiling height into which the building is divided and which are intended to satisfy functional requirements linked to its use.2
Additional notes: In municipal regulations of land use plans (and in municipal regulations in general) it is useful to distinguish between floors above the threshold level and floors below the threshold level. In this context, the floor corresponding to the threshold level is counted in the number of floors above the threshold level and is called floor 1. The first floor below the threshold level is called floor -1.
1: Prague building regulations
2: Decreto Regulamentar n.º 5/2019, de 27 de setembro