- Einstein was also strongly influenced by the philosophical notions of Austrian physicist Ernst Mach, who rejected the idea of an absolute frame of reference for spacetime.
- Due to the different ways of construal and the different reference points, three spatial frames of reference are put forward.They are the relative, the intrinsic and the absolute frames of reference.
- That hill's an absolute doddle (to climb).
- We now have the absolute proof of his guilt.
- Her new dress is an absolute dream.