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Semantic equivalence

Wikipedia contributorsAdapted for Fathomly · View authors
1 min read
Source updated June 9, 2026

In computer metadata, semantic equivalence is a declaration that two data elements from different vocabularies contain data that has similar meaning. There are three types of semantic equivalence statements:

  • Class or concept equivalence. A statement that two high level concepts have similar or equivalent meaning.
  • Property or attribute equivalence. A statement that two properties, descriptors or attributes of classes have similar meaning.
  • Instance equivalence. A statement that two instances of data are the same or refer to the same instance.

01Example

Assume that there are two organizations, each having a separate data dictionary. The first organization has a data element entry:

<DataElement> <Name>PersonFamilyName</Name> <Definition>The family name of a person shared with other members of their family.</Definition> <DataElement>

and a second organization has a data dictionary with a data element with the following entry:

<DataElement> <Name>IndividualLastName</Name> <Definition>The name of an individual person shared with other members of their family.</Definition> <DataElement>

these two data elements can be considered to have the same meaning and can be marked as semantically equivalent.

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Sources and credits

This article is adapted from the Wikipedia article “Semantic equivalence”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.

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Related topics

Logical equivalence

In logic and mathematics, statements p {\displaystyle p} and q {\displaystyle q} are said to be logically equivalent if they have the same truth value in every model. The logical equivalence of p {\displaystyle p} and q {\displaystyle q} is sometimes expressed as p ≡ q {\displaystyle p\equiv q} , p :: q {\displaystyle p::q} , E p q {\displaystyle {\textsf {E}}pq} , or p ⟺ q {\displaystyle p\iff q} , depending on the notation being used.

Metadata

Metadata is data (or information) that defines and describes the characteristics of other data. It often helps to describe, explain, locate, or otherwise make data easier to retrieve, use, or manage.

Vocabulary-based transformation

In metadata, a vocabulary-based transformation is a transformation aided by the use of a semantic equivalence statements within a controlled vocabulary. Many organizations today require communication between two or more computers.