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.

Open-Neighborhood

A set of points in a topological space that includes a point and all points sufficiently close to it.

Operational Control

The authority or power to manage and direct operations within an organization.

Operations Management

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

Ophtalmological

Relating to the branch of medicine that deals with the anatomy, functions, and diseases of the eye.

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.

Oppositionism

The practice or philosophy of opposing or resisting a particular authority or ideology.