Ontology

In information science, an explicit formal specification of how to represent the objects, concepts and other entities that are assumed to exist in some area of interest and the relationships among them. (NCI Thesaurus)

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Ontario

A province in east-central Canada bordered by Quebec to the east and Manitoba to the west.

Ontak

A drug used to treat cutaneous T-cell lymphoma that can bind the cytokine IL-2 and that has not responded to other…

Onset of Angina Pectoris Event

The beginning of the experience of the symptom complex of angina pectoris.

Onset of action

The length of time it takes for a medicine to start to work.

Onset Date

The date (and time) on which the event began.

Onset

The start, beginning, or early stages.