English to English Dictionary

One-upmanship

The practice of continually trying to gain an advantage over or to outdo other people.

Opacity

The quality of being opaque; the inability of light to pass through something.

Opaque

Not transparent or translucent; impenetrable to light or not allowing light to pass through.

Open a Pandora's box

To perform an action that small or seemingly harmless in itself, but which unexpectedly generates a vast and uncontrollable cascade of severe problems and complications.

Operations management

The administration of business practices to create the highest level of efficiency possible within an organization.

Ophthalmologist

A physician who specializes in the medical and surgical care of the eyes and visual system, preventing, diagnosing, and treating eye diseases and disorders.

Ophthalmology

The branch of medicine concerned with the study and treatment of disorders and diseases of the eye.

Ophthalmoscope

An instrument with a light and mirror system used for examining the interior structures of the eye, especially the retina.

Optimum

The most favorable condition, degree, or amount for obtaining a given result.

Opulence

Great wealth or luxuriousness.

Originality

The ability to think independently and create new, fresh, or unique ideas and works.

Orthography

The conventional spelling system of a language.