A property is a characteristic, or aspect, of an object class (person, organisation, structure or event).

Properties can be very general things, such as Given name or Preferred language, or very specific things such as Creatine kinase-myocardial band isoenzyme level or Number of children attending an early childhood education program.

Joining a property with an object class creates a data element concept.

There are over 2,000 properties in METEOR. To make navigating them easier, they are organised into property groups.