A  without a  in the  distributed in the .

Notes

• The meaning of a  is expressed in a human-readable form by its . Each  also has a formal  that provides a computer-processable representation of the meaning of the concept.

• A primitive concept has a  that is not sufficient to computably distinguish it from other .

Example

• The concept is primitive because the following definition is not sufficient to distinguish atypical appendicitis from any other type of appendicitis:

  5596004|atypical appendicitis (disorder)|  <<<116680003|is a|=74400008|appendicitis| 116676008 |associated morphology| = 23583003 |inflammation| 363698007 |finding site| = 66754008 |appendix structure|

Change Notices

• Changes introduced in the July 2018 release of the International Edition allow assertions to be represented as axioms in the OWL axiom reference set file. This will allow concepts to be defined by multiple sufficient definitions, some of which may contain assertions that are not necessarily true.

• Following these changes a concept will be marked as primitive unless it is sufficiently defined by .  Although, in some cases, the OWL axioms may provide a sufficient definition that cannot be fully represented as relationships.

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