# Relationship Types

Each map between source and target should have a defined type of map relationship describing the type of relationship or degree of equivalence of source and target code.

Snap2SNOMED uses the following definitions

<table data-full-width="true"><thead><tr><th width="210.24560546875">Relationship type</th><th>Description</th></tr></thead><tbody><tr><td>Equivalent</td><td>The definitions of the concepts mean the same thing (including when structural implications of meaning are considered) (i.e. extensionally identical).</td></tr><tr><td>Broader</td><td>The target mapping is broader in meaning than the source concept.</td></tr><tr><td>Narrower</td><td>The target mapping is narrower in meaning than the source concept.</td></tr><tr><td>Inexact</td><td>The target mapping overlaps with the source concept, but both source and target cover additional meaning, or the definitions are imprecise and it is uncertain whether they have the same boundaries to their meaning.</td></tr><tr><td>No match/unmatched</td><td>There is no match for this concept in the target code system.</td></tr></tbody></table>

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