What dimension is always considered vertical?

The dimension that is always considered vertical is height. Height refers to the measurement from the base to the top of an object and describes how tall that object is when oriented upright. In measurement contexts, height is consistently defined as the vertical element, distinguishing it from length and breadth, which are typically horizontal measures, and depth, which can refer to the distance downward from a surface but is not exclusively vertical. Thus, height is the dimension that distinctly signifies verticality in spatial contexts.