largeness
size / magnitude / vastness / amplitude
[U] Uncountable
This term emphasizes the objective quality of scale and often carries a sense of overwhelming proportion or vastness. It is typically employed in formal or descriptive writing to highlight a physical or conceptual magnitude that evokes a specific emotional response, such as awe or intimidation, rather than simply stating a measurement.
Used to describe the abstract quality of size, such as the largeness of a room or the largeness of a heart.