Definitions:
a continuous area or expanse which is free, available, or unoccupied

the dimensions of height, depth, and width within which all things exist and move

an interval of time (often used to suggest that the time is short considering what has happened or been achieved in it)

the portion of a text or document available or needed to write about a subject

the freedom to live, think, and develop in a way that suits one

one of two possible states of a signal in certain systems.

position (two or more items) at a distance from one another