In quantum mechanics, the Hamiltonian is an observable that determines the system's energy levels.

The changes in the experiment were easily observable over the course of a week.

The observableness of the new quantum device will determine whether its effects can be reliably measured.

During the seminar, the researcher explained how observables determine the outcomes of quantum measurements.

Variations in observabilities across models make it difficult to draw consistent conclusions.

Improving observability across the system helped the team detect subtle failures before they impacted users.

The observative hiker noticed the faint trail markers hidden among the ferns.

An Observant walked alongside the pilgrims, offering a quiet blessing before sunrise.

Their observancies of the ancient rites were noted by the visiting scholars.

Although considered archaic by many, the word observancy still appears in some legal texts to mean adherence to ancient rites.