Aside from structural definitions, trees are commonly defined by use.

Angles are commonly defined according to the right hand rule.

The generation is commonly defined as Americans born from 1946 to 1964.

Vocabulary is commonly defined as "all the words known and used by a particular person".

The first commonly defined challenge is the need for meaningful and appropriate management units.

Matter is commonly defined as the substance of which physical objects are composed.

Autonomy is commonly defined as the ability to make decisions without human intervention.

Job satisfaction is commonly defined as the extent to which employees like their work.

In wireless networks, this is commonly defined by path loss.

Obesity is commonly defined as weighing 20 percent greater than the average.